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#1
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6M5 datasheet
Hello.
6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex |
#2
Posted to rec.audio.tubes
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6M5 datasheet
Alex wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. |
#3
Posted to rec.audio.tubes
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6M5 datasheet
Alex wrote:
Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex The near equivalent to the 6M5 is the EL80. Steve H |
#4
Posted to rec.audio.tubes
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6M5 datasheet
A 6GK6 makes a nice low cost alternate to a 6BQ5/EL84. Has a 13.2 W plate.
-- Bob L. Lindenhurst, NY "Patrick Turner" wrote in message ... Alex wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. |
#5
Posted to rec.audio.tubes
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6M5 datasheet
Can find datasheets here http://www.mif.pg.gda.pl/homepages/frank/vs.html It shows up he http://www.mif.pg.gda.pl/homepages/f.../054/2/215.pdf It says that it's the same as EL80 ================================================== ======================= What did Santa Claus say at the house of ill repute? "Ho ho ho!" |
#6
Posted to rec.audio.tubes
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6M5 datasheet
Thanks, but it does not bring up 6M5 daatasheet. It only suggests that the
closest equivalent is EL80, but how can I be sure? "robert casey" wrote in message ... Can find datasheets here http://www.mif.pg.gda.pl/homepages/frank/vs.html It shows up he http://www.mif.pg.gda.pl/homepages/f.../054/2/215.pdf It says that it's the same as EL80 ================================================== ======================= What did Santa Claus say at the house of ill repute? "Ho ho ho!" |
#7
Posted to rec.audio.tubes
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6M5 datasheet
"Patrick Turner" wrote in message ... Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. I typed "6M5 data" in Google, but could never get a genuine 6M5 datasheet scan. Some say it is like EL84, others say it is like EL80. However, EL84 and EL80 are not identical. Though both have rather high transconductance, EL80 according to its datasheet runs at 33mA (as 6F6) and would require higher plate load impedance, than EL84 which runs at 45...48mA (as 6V6). That is why I brought the question up at this forum, hoping that some guru would have reliable information on hand. Regards, Alex |
#8
Posted to rec.audio.tubes
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6M5 datasheet
On Dec 21, 8:39*am, flipper wrote:
On Fri, 21 Dec 2007 10:46:26 GMT, "Alex" wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Never heard of a 6M5 (not that I've heard of everything) and none of my references mention it. The only thing I can think of with a '6' and an 'M' in it that vaguely meets your description would be a 6CM6. That's a 9 pin 6V6 but it's not an EL84 equivalent despite being an audio power amp with 12 Watt plate. Can find datasheets here http://www.mif.pg.gda.pl/homepages/frank/vs.html Never thought I'd see a reference to a 6CM6! It's the O/P tube used in the Stromberg-Carlson AR-411 tube amplifier - I restored one earlier this year. I managed to buy a few spares from a very helpful chap in the US. I get the feeling that they are not as common as 6AQ5's or octal 6V6's. Before I found replacements I was contemplating making a base adapter (9 pin to 7 pin) and using a couple of 6AQ5's (rebiased), then my USA friend rescued me! Cheers, and a Merry Christmas to all Vacuumlanders! Roger PS. To Alex - I've never heard of a 6M5, either. |
#9
Posted to rec.audio.tubes
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6M5 datasheet
On Dec 22, 12:40 am, Patrick Turner wrote:
Alex wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. Hi, The 6M5 Tube = European EL80 was derived from the 8 pin Rimlock Socket EL41 or 6CK5 It is in no way the same as the 6BQ5/EL86. The socket connections are different, and mainly, the 6M5 has a load resistance of 7000 Ohm where the 6BQ5 has 5000 ohms. The 6M5 was used in quite a few Australian Radios, In Kriesler, HMV , Astor and many more. It really had no equivalent in a 9 pin socket. The closest to it is the 6GW8/ECL86 pentode part. The characteristics and voltages are very similar.So is the load resistance of 7000 Ohms. The Filament current is also nearly the same. This means, the same output transformer can be used This tube was made in Australia by Philips, Mullard and AWV (RCA). Also in the US a few companies manufactured it. it was not popular in europe. The manufacturres most of the time went straigt from the EL41 to the EL84, which was then the most used single ended output tubes in radios. The Pin connections a Pin 1=g2, Pin 2=g1, Pin 3=k+g3, Pin4,5 = Heater , pin 6=IC, Pin 7=a, Pin 8=IC and Pin 9=NC. The 6M5s had a bit of a problem, they tended to draw grid current when they started to get old. I had 2 radios today, where the grid was about 4V positive . The cathode voltage went up to about 11Volts and the tube took a lot more anode current. It also got very hot. It is not a very nice looking tube, specially when used for a long time. The inside goes black and outside the anode inspection holes, a silver layer builds up. The same applied to the EL41. I hope this helps a bit. If you need more info , Data , history etc, please let me know. Regards, Horst |
#11
Posted to rec.audio.tubes
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6M5 datasheet
On Dec 23, 3:20*am, wrote:
On Dec 22, 12:40 am, Patrick Turner wrote: Alex wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. Hi, The 6M5 Tube = European EL80 *was derived from the 8 pin Rimlock Socket EL41 or 6CK5 It is in no way the same as the 6BQ5/EL86. The socket connections are different, and mainly, the 6M5 has *a load resistance of 7000 Ohm where the 6BQ5 has 5000 ohms. The 6M5 was used in quite a few Australian Radios, In Kriesler, HMV , Astor and many more. It really had no equivalent in a 9 pin socket. The closest to it is the 6GW8/ECL86 pentode part. The characteristics and voltages are very similar.So is the load resistance of 7000 Ohms. *The Filament current is also nearly the same. This means, the same output transformer can be used This tube was made in Australia by Philips, Mullard and *AWV (RCA). Also in the US *a few companies manufactured it. it was not popular in europe. The manufacturres most of the time went straigt from the EL41 to the EL84, which was then the most used single ended output tubes in radios. The Pin connections a Pin 1=g2, *Pin 2=g1, Pin 3=k+g3, * *Pin4,5 = Heater , *pin 6=IC, *Pin 7=a, Pin 8=IC *and Pin 9=NC. The 6M5s had a bit of a problem, they tended to draw grid current when they started to get old. *I had 2 radios today, where the grid was about 4V positive . The cathode voltage went up to about 11Volts and the tube took a lot more anode current. It also got very hot. It is not a very nice looking tube, specially when used for a long time. The inside goes black and outside the anode inspection holes, a silver layer builds up. The same applied to the EL41. I hope this helps a bit. If you need more info , Data , history etc, please let me know. Regards, Horst- Hide quoted text - - Show quoted text - Thanks, Horst. Your reply was quite comrehensive. I need to restore a PHILIPS radio with 6M5. The 6M5 is all dark and silvery from inside the bulb, indicating that it is most likely dead. I would probably use EL84, but now I need to be careful not to use EL84 in a standard mode with 48mA anode current in order not to saturate the transformer. What would you recommend: - artificially reduce anode current in EL84 by biasing it more than typical; - reduce Ug2 to EL84 to 180V; - find another substitution valve with typical 33...36mA at Ug2=250V; - something else?? Regards, Alex |
#12
Posted to rec.audio.tubes
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6M5 datasheet
On Dec 24, 6:14 pm, Alex wrote:
On Dec 23, 3:20 am, wrote: On Dec 22, 12:40 am, Patrick Turner wrote: Alex wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. Hi, The 6M5 Tube = European EL80 was derived from the 8 pin Rimlock Socket EL41 or 6CK5 It is in no way the same as the 6BQ5/EL86. The socket connections are different, and mainly, the 6M5 has a load resistance of 7000 Ohm where the 6BQ5 has 5000 ohms. The 6M5 was used in quite a few Australian Radios, In Kriesler, HMV , Astor and many more. It really had no equivalent in a 9 pin socket. The closest to it is the 6GW8/ECL86 pentode part. The characteristics and voltages are very similar.So is the load resistance of 7000 Ohms. The Filament current is also nearly the same. This means, the same output transformer can be used This tube was made in Australia by Philips, Mullard and AWV (RCA). Also in the US a few companies manufactured it. it was not popular in europe. The manufacturers most of the time went straight from the EL41 to the EL84, which was then the most used single ended output tubes in radios. The Pin connections a Pin 1=g2, Pin 2=g1, Pin 3=k+g3, Pin4,5 = Heater , pin 6=IC, Pin 7=a, Pin 8=IC and Pin 9=NC. The 6M5s had a bit of a problem, they tended to draw grid current when they started to get old. I had 2 radios today, where the grid was about 4V positive . The cathode voltage went up to about 11Volts and the tube took a lot more anode current. It also got very hot. It is not a very nice looking tube, specially when used for a long time. The inside goes black and outside the anode inspection holes, a silver layer builds up. The same applied to the EL41. I hope this helps a bit. If you need more info , Data , history etc, please let me know. Regards, Horst- Hide quoted text - - Show quoted text - Thanks, Horst. Your reply was quite comrehensive. I need to restore a PHILIPS radio with 6M5. The 6M5 is all dark and silvery from inside the bulb, indicating that it is most likely dead. I would probably use EL84, but now I need to be careful not to use EL84 in a standard mode with 48mA anode current in order not to saturate the transformer. What would you recommend: - artificially reduce anode current in EL84 by biasing it more than typical; - reduce Ug2 to EL84 to 180V; - find another substitution valve with typical 33...36mA at Ug2=250V; - something else?? Regards, Alex Hi Alex, Before you discard your 6M5 as bad, do a couple of tests. You need a High impedance meter, Either a digital voltmeter or a VTVM.. 1st disconnect the coupling capacitor from the grid of the 6M5. Read the voltage from the grid to ground. you should have zero volts, if your radio uses a cathode resistor on the 6M5 cathode . If it uses semiautomatic bias, then you should have about -6 or similar on the grid. The main thing, you should not have a positive voltage at all. If it is positive your tube is crook. 2nd. If it is zero volts, measure the cathode voltage. this should be about 6 to 7 volts. If it is less, then the valve is weak. If it is ok, replace your coupling condenser and fit a new one. If it is faulty, the closest (just about completely identical) tune is the 6GW8/ECL86. No component values need to be altered including the cathode resistor. both have 170Ohm and both tubes draw 36mA anode current. The Gm on both is 10mA/V It is easy to rewire the socket. Do it in the following sequence 1.) Move the wire from pin 7 to pin 6 (a) 2.) Move the wire from pin 1 to pin 7 (g2) 3.) Exchange the wires from pin 2 and pin 3 (cg3 and g1) Pins 1,8 and 9 should have no connections. Short pin 9 to ground.(at) This will give you identical results . If you don't have a 6GW8, then I am happy to send you a new one at no cost. The 6GW8 is really a very good reliable tube. the triode section is identical to half a 12AX7/ECC83. The tube started to come in to use in big style in the early 60's. It was used a lot in the Japanese amplifiers. (Pioneer , Sansui, Trio etc) . Mostly in push pull in this Tuner-Amps. It got a reasonably bad reputation then, because the Japanese, to get the power ratings up, used it to the limits. It just got to hot and died from shorted grid and from open cathodes. I replaced plenty. During this time I worked at Astor Radio in the service dept. Astor being part of EIL. Did all the Pioneer repairs, and during this time i did them all. (EIL was the Australian importer of pioneer). When the tube was used within its ratings, it performed for a very long time without problems. Let me know, if you need one, and let me have your mailing address. My email is: Happy Christmas, Horst |
#13
Posted to rec.audio.tubes
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6M5 datasheet
On Dec 24, 10:07*pm, wrote:
On Dec 24, 6:14 pm, Alex wrote: On Dec 23, 3:20 am, wrote: On Dec 22, 12:40 am, Patrick Turner wrote: Alex wrote: Hello. 6M5 output tube was common in some radios. I have read that 6M5 was similar to EL84, but have never seen its real datasheet. Could anybody on this forum please post me a link to an original 6M5 datasheet? Thanks and regards, Alex Before asking here, most people enter '6M5 tube data ' into Google, or any other tube number or transistor number. See Duncan's TDSL pages with lots of links. The 6M5 is indeed like 6BQ5/EL84, but not as good imho, and I often change the socket connections of radios from 6M5 to suit 6BQ5 because the 6M5 is no longer made and the 6BQ5 is very plentiful. Patrick Turner. Hi, The 6M5 Tube = European EL80 *was derived from the 8 pin Rimlock Socket EL41 or 6CK5 It is in no way the same as the 6BQ5/EL86. The socket connections are different, and mainly, the 6M5 has *a load resistance of 7000 Ohm where the 6BQ5 has 5000 ohms. The 6M5 was used in quite a few Australian Radios, In Kriesler, HMV , Astor and many more. It really had no equivalent in a 9 pin socket. The closest to it is the 6GW8/ECL86 pentode part. The characteristics and voltages are very similar.So is the load resistance of 7000 Ohms. *The Filament current is also nearly the same. This means, the same output transformer can be used This tube was made in Australia by Philips, Mullard and *AWV (RCA). Also in the US *a few companies manufactured it. it was not popular in europe. The manufacturers most of the time went straight from the EL41 to the EL84, which was then the most used single ended output tubes in radios. The Pin connections a Pin 1=g2, *Pin 2=g1, Pin 3=k+g3, * *Pin4,5 = Heater , *pin 6=IC, *Pin 7=a, Pin 8=IC *and Pin 9=NC. The 6M5s had a bit of a problem, they tended to draw grid current when they started to get old. *I had 2 radios today, where the grid was about 4V positive . The cathode voltage went up to about 11Volts and the tube took a lot more anode current. It also got very hot. It is not a very nice looking tube, specially when used for a long time. The inside goes black and outside the anode inspection holes, a silver layer builds up. The same applied to the EL41. I hope this helps a bit. If you need more info , Data , history etc, please let me know. Regards, Horst- Hide quoted text - - Show quoted text - Thanks, Horst. Your reply was quite comrehensive. I need to restore a PHILIPS radio with 6M5. The 6M5 is all dark and silvery from inside the bulb, indicating that it is most likely dead. I would probably use EL84, but now I need to be careful not to use EL84 in a standard mode with 48mA anode current in order not to saturate the transformer. What would you recommend: - artificially reduce anode current in EL84 by biasing it more than typical; - reduce Ug2 to EL84 to 180V; - find another substitution valve with typical 33...36mA at Ug2=250V; - something else?? Regards, Alex Hi Alex, Before you discard your 6M5 as bad, do a couple of tests. You need a High impedance meter, Either a digital voltmeter or a VTVM.. 1st disconnect the coupling capacitor from the grid of the 6M5. Read the voltage from the grid to ground. you should have zero volts, if your radio uses a cathode resistor on the 6M5 cathode . *If it uses semiautomatic bias, then you should have about -6 or similar on the grid. *The main thing, you should not have a positive voltage at all. If it is positive your tube is crook. 2nd. If it is zero volts, measure the cathode voltage. this should be about 6 to 7 volts. If *it is less, then the valve is weak. If it is ok, replace your coupling condenser and fit a new one. If it is faulty, the closest (just about completely identical) tune is the 6GW8/ECL86. No component values need to be altered including the cathode resistor. both have 170Ohm *and both tubes draw 36mA anode current. The Gm on both is 10mA/V It is easy to rewire the socket. Do it in the following sequence 1.) Move the wire from pin 7 to pin 6 (a) 2.) Move the wire from pin 1 to pin 7 (g2) 3.) Exchange the wires from pin 2 and *pin 3 (cg3 and g1) Pins 1,8 and 9 should have no connections. Short pin 9 to ground.(at) This will give you identical results . If you don't have a 6GW8, then I am happy to send you a new one at no cost. The 6GW8 is really a very good reliable tube. the triode section is identical to half a 12AX7/ECC83. The tube started to come in to use in big style in the early 60's. It was used a lot in the Japanese amplifiers. (Pioneer , Sansui, Trio etc) . Mostly in push pull in this Tuner-Amps. It got a reasonably bad reputation then, because the Japanese, to get the power ratings up, used it to the limits. It just got to hot and died from shorted grid and from open cathodes. I replaced plenty. During this time I worked at Astor Radio in the service dept. Astor being part of EIL. Did all the Pioneer repairs, and during this time i did them all. (EIL was the Australian importer of pioneer). When the tube was used within its ratings, it performed for a very long time without problems. Let me know, if you need one, and let me have your mailing address. My email is: * Happy Christmas, Horst- Hide quoted text - - Show quoted text - Thanks, Horst. I appreciate your thorough advice very much. It sounds you have had a lot of experience. Merry Christmas and a happy New Year. Regards, Alex |
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