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Old 12th November 2012, 08:38 PM   #31
TheGimp is offline TheGimp  United States
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Tie the screen (G2) to the Plate (anode) to form a triode from a pentode.
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Old 12th November 2012, 09:19 PM   #32
Jaap is offline Jaap  Netherlands
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A few years ago there was on this forum some criticism on this original RCA circuit with the 6au6 in it. I cannot believe that a leading tube-technology firm of those days would publish crap. This design must have some merits. I will try to build it with a 6sn7 at the front with CCS or VCCS on top of the first tubehalf and a led under it.
Has anyone heard this RCA design with his or her own ears ?

By the way, there are 7-pin sockets that fit in 9-pin holes.

Last edited by Jaap; 12th November 2012 at 09:21 PM.
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Old 12th November 2012, 09:25 PM   #33
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Originally Posted by pancaQe View Post
Thanks, I'll post how it's coming along.
Ok, good luck with the build.

jeff
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Old 12th November 2012, 09:27 PM   #34
Jaap is offline Jaap  Netherlands
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Alternative with 6sl7
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Old 12th November 2012, 09:47 PM   #35
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Tony, those tubes have suddenly risen dramatically in value since you bought so many of them!!
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Old 12th November 2012, 09:48 PM   #36
AJT is offline AJT  Philippines
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Quote:
Originally Posted by pancaQe View Post
Tony, I have a couple GE 6LU8A, I thought they were oscillator amplifier. They're also compactron (tiny)
it has a 12at7 like triode and a 6v6 like pentode all in one envelope, rated at 14watts plate it is better than 6BQ5 imho...

i also replace 6V6, 6BQ5 with 6GK6, a tv tube and a good performer too...

i tend to favor tv tubes for audio, lots of sleeper tubes that are not hyped and so you can get really cheap....

6LU8 is a compactron, 6LR8 is a novar using the same innards...
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Old 12th November 2012, 09:49 PM   #37
AJT is offline AJT  Philippines
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Tony, those tubes have suddenly risen dramatically in value since you bought so many of them!!
huh? last time i looked, they were going for 0.75 cents a bottle if you buy more than 10...
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Old 12th November 2012, 10:05 PM   #38
SY is offline SY  United States
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Quote:
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A few years ago there was on this forum some criticism on this original RCA circuit with the 6au6 in it. I cannot believe that a leading tube-technology firm of those days would publish crap.
Understand who the audience was- lowest common denominator mass market manufacturers, especially (for audio) cheap consoles and radios. The main virtues are "cheap" and "reliable." This is why some of us were surprised that an RCA engineer managed to slip the superb 50 watter into the mix.
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Old 13th November 2012, 03:38 AM   #39
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Where are you finding the 6lr8 that cheap please ?
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Old 13th November 2012, 06:20 AM   #40
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not the 6lr8, but the 13lr8 is...at rogalski's in florida...
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