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#1
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pre-amp for Dyna ST-70
built a passive pre-amp for my rebuilt ST-70 using a step attenuator.
Would an active pre-amp work better with the Dynaco? Have the Foreplay in mind... Thanks, Twang |
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#2
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In my experience, things always go better with a little Foreplay.
;-) From: (Tubetwang) Organization: http://groups.google.com/ Newsgroups: rec.audio.tubes Date: 18 Jul 2003 09:01:53 -0700 Subject: pre-amp for Dyna ST-70 built a passive pre-amp for my rebuilt ST-70 using a step attenuator. Would an active pre-amp work better with the Dynaco? Have the Foreplay in mind... Thanks, Twang |
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#3
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Tubetwang wrote:
built a passive pre-amp for my rebuilt ST-70 using a step attenuator. Would an active pre-amp work better with the Dynaco? Can you play load enough with all your signal sources? If that's the case you don't need a preamp, if you can't then you do need a preamp. If you want a preamp as an "effect unit" to change the sound, that's a different matter... Best regards, Mikkel C. Simonsen |
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#4
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Hi ,
If you want a preamp as an "effect unit" to change the sound, that's a different matter... It might be better tu upgrade the ST-70 then ..... Or even rebuild it just using the iron and a different topology ...... 2A3 - PP might be an option ........ Ronald . |
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#5
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Hi ,
2A3 - PP might be an option ........ Why not 6B4G PP - they will fit in the original sockets. Ned Carlson has made such an amp using the Sovtek 6B4G tubes as far as I remember... OK , you're right , but the 2A3 might be better known ..... It's up to Tubetwang now to react ...... So we can help him better . Regards , Ronald . |
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#6
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Ronald wrote:
Hi , If you want a preamp as an "effect unit" to change the sound, that's a different matter... It might be better tu upgrade the ST-70 then ..... Or even rebuild it just using the iron and a different topology ...... 2A3 - PP might be an option ........ Why not 6B4G PP - they will fit in the original sockets. Ned Carlson has made such an amp using the Sovtek 6B4G tubes as far as I remember... Best regards, Mikkel C. Simonsen |
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#7
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"Ronald" wrote in message ...
Hi , 2A3 - PP might be an option ........ Why not 6B4G PP - they will fit in the original sockets. Ned Carlson has made such an amp using the Sovtek 6B4G tubes as far as I remember... OK , you're right , but the 2A3 might be better known ..... It's up to Tubetwang now to react ...... So we can help him better . Regards , Ronald . Thanks guys , you have answered well! This ST70 has been rebuild with Ned's board and power supply and i am very please with the sound of it with the Jensen Copper caps. I had rebuild two other amps previously, namely Dyna (SCA35)and Heatkit AA-151 using a stepped attenuator on each. The soud was "blooming " quicker on those (1/4 turn). I have to turn the volume 15 minutes more on the ST70 to get the same sound. So i was wondering... It's working great so i'll enjoy it... Thanks again! Twang |
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#8
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I don't know the ST70 that good and don't know Ned's board at all ....
But if not already you can get some extra gain if the cathode resistors are not by-passed yet ...... On the other hand this might add some colouring of the sound ...... "Tubetwang" schreef in bericht om... "Ronald" wrote in message ... Hi , 2A3 - PP might be an option ........ Why not 6B4G PP - they will fit in the original sockets. Ned Carlson has made such an amp using the Sovtek 6B4G tubes as far as I remember... OK , you're right , but the 2A3 might be better known ..... It's up to Tubetwang now to react ...... So we can help him better . Regards , Ronald . Thanks guys , you have answered well! This ST70 has been rebuild with Ned's board and power supply and i am very please with the sound of it with the Jensen Copper caps. I had rebuild two other amps previously, namely Dyna (SCA35)and Heatkit AA-151 using a stepped attenuator on each. The soud was "blooming " quicker on those (1/4 turn). I have to turn the volume 15 minutes more on the ST70 to get the same sound. So i was wondering... It's working great so i'll enjoy it... Thanks again! Twang |
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#9
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I've rebuilt a number for ST-70s using different pre-packaged mods. With
all due respects to Ned, the Welbourne Labs mod is the best I've heard so far. I'm in the process of putting together my second Welbourne ST-70 (the first was sold to a fellow who wanted it so bad he was willing to pay $700). I've been working on a few tube pre-amps. The Van Alstine PAS mod was frankly a disappointment. I've been looking at Patrick Turner's April 200 circuit and it looks most intriguing . . . - Jon From: "Ronald" Organization: @Home Benelux Newsgroups: rec.audio.tubes Date: Sat, 19 Jul 2003 20:28:19 +0200 Subject: pre-amp for Dyna ST-70 Hi , 2A3 - PP might be an option ........ Why not 6B4G PP - they will fit in the original sockets. Ned Carlson has made such an amp using the Sovtek 6B4G tubes as far as I remember... OK , you're right , but the 2A3 might be better known ..... It's up to Tubetwang now to react ...... So we can help him better . Regards , Ronald . |
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