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#1
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
Hi:
I couldn't find 6CG7 or 6FQ7 in Tube Lore. Any guesses as to why they are not in there? Does anyone know what year the 6CG7 was released? Thanks. Gerry |
#2
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
GerryE123 wrote:
I couldn't find 6CG7 or 6FQ7 in Tube Lore. Any guesses as to why they are not in there? In the lorish scene, the 6CG7 was one of many variants in the 9-pin dual triode categories. Hurting its lorishness, it was originally sold as a TV deflection oscillator, and only later did it find its way into some hi-fi amps. In some people's minds, if it's in a Marantz then it must have lore behind it, in other people's minds it's a TV tube and therefore uninteresting. Contrast this with the "grandaddy" dual triodes (6SN7 and bazillion variants and manufacturers) which are quite lorish (the 6SN7 even has its own website!). Even though the 6CG7 is electrically equivalent and standard equipment in some interesting hi-fi stuff, it just doesn't seem to cut the snuff with at least one big-name hobnobber! Does anyone know what year the 6CG7 was released? Thanks. It first appears in mid-50's ARRL basing charts, along with a metric buttload of other 9-pin dual triodes. In fact www.6sn7.com says the 6CG7 came out in 1954 :-). Tim. |
#3
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
wrote in message
ups.com... In the lorish scene, the 6CG7 was one of many variants in the 9-pin dual triode categories. Hurting its lorishness, it was originally sold as a TV deflection oscillator, and only later did it find its way into some hi-fi amps. In some people's minds, if it's in a Marantz then it must have lore behind it, in other people's minds it's a TV tube and therefore uninteresting. Contrast this with the "grandaddy" dual triodes (6SN7 and bazillion variants and manufacturers) which are quite lorish (the 6SN7 even has its own website!). Even though the 6CG7 is electrically equivalent and standard equipment in some interesting hi-fi stuff, it just doesn't seem to cut the snuff with at least one big-name hobnobber! Does anyone know what year the 6CG7 was released? Thanks. It first appears in mid-50's ARRL basing charts, along with a metric buttload of other 9-pin dual triodes. In fact www.6sn7.com says the 6CG7 came out in 1954 :-). Tim. Thanks for the humor and good info Tim! There was a thread on the Tube Asylum about replacing the 12AU7 phase inverter in McIntosh amps (ex. MC-60) with a 6CG7. It was suggested as a "superb" mod. I was curious as to why Mac didn't use the 6CG7 in the first place. My guess was that the 6CG7 had yet to be released at the time the MC-60 was developed. It's close, the MC-60 came out in 1955. RAT's own Steve O summed up the situation in Asylum thread. The thread can be viewed he http://www.audioasylum.com/scripts/t...tubes&m=184886 Gerry |
#5
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
Hi Patrick,
The samples of 6CG7 made here in Oz had exactly the same internal structure of the 6SN7; the 6CG7 IS a 6SN7 crammed into a 9 pin package, Also it is known that at the end of NOS 6SN7 production 6CG7 systems were retrofitted into octal envelopes (by GE and RCA, IIRC) Tom -- Live is too short to be taken seriously. - Oscar Wilde |
#6
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
Tom Schlangen said:
The samples of 6CG7 made here in Oz had exactly the same internal structure of the 6SN7; the 6CG7 IS a 6SN7 crammed into a 9 pin package, Also it is known that at the end of NOS 6SN7 production 6CG7 systems were retrofitted into octal envelopes (by GE and RCA, IIRC) Maybe some of you may be able to clear up something for me: The 6FQ7 is often said to be a direct replacement for the 6CG7. Other sources tell me it's a different tube, and the better replacement would be a 12BH7. Now when browsing through my tube books, I fond that 6FQ7 and 6CG7 are often called similar or even equal, while the 12BH7 seems to be a totally different kind of animal. I use 6SN7 a lot, but I'm looking for a good Noval replacement because sometimes, physical restrictions prevent me from using an Octal tube. How do they compare in say a Cathodyne phase splitter or driver? -- "Due knot trussed yore spell chequer two fined awl miss steaks." |
#7
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
Hi Sander,
Maybe some of you may be able to clear up something for me: The 6FQ7 is often said to be a direct replacement for the 6CG7. Other sources tell me it's a different tube, and the better replacement would be a 12BH7. I have several NOS/NIB RCA side getter ones in the drawer (a complete 5-pack and a few more) which say on the sleeve: 6FQ7 6CG7 Also, on the tubes itselves, it is mentioned twice, once in red lettering, once etched in glass like this (use monospaced font to view): /------\ | 6FQ7 | | 6CG7 | \------/ I think we can trust RCA when they obviously consider them to be the same tube. Hope it helps, Tom -- Anyone who considers protocol unimportant has never dealt with a cat. - R. Heinlein |
#8
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
Maybe some of you may be able to clear up something for me: The 6FQ7 is often said to be a direct replacement for the 6CG7. Other sources tell me it's a different tube, and the better replacement would be a 12BH7. The 6CG7 has an internal shield between the triode sections. The 6FQ7 doesn't. That's the only difference. |
#9
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
robert casey said:
Maybe some of you may be able to clear up something for me: The 6FQ7 is often said to be a direct replacement for the 6CG7. Other sources tell me it's a different tube, and the better replacement would be a 12BH7. The 6CG7 has an internal shield between the triode sections. The 6FQ7 doesn't. That's the only difference. Thank you, Robert and Tom . Due to an unexpected hospital admission I wasn't able to respond earlier. -- "Due knot trussed yore spell chequer two fined awl miss steaks." |
#10
Posted to rec.audio.tubes
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6CG7/6FQ7 Not In Tube Lore?
"GerryE123" wrote in message ... Hi: I couldn't find 6CG7 or 6FQ7 in Tube Lore. Any guesses as to why they are not in there? Does anyone know what year the 6CG7 was released? Thanks. Gerry I think there's something in the forward of tube lore to the effect that tubes designed after 1950 are not included, unless they're famous for some reason. I think it's probably an oversight, as the 6CG7 is reasonably famous. Also notably (to me) absent are some of the pentodes used in portable record players - well, maybe not a big deal, but I'd like to see info on tubes like the 25EH5, etc. |
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