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Old 15th September 2012, 08:08 AM   #1
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Default I'm looking for 6an8 (as V1) schematics

I would like to see schematics using 6an8 tube as V1

my interest is about guitar or bass schematics but any schematic having 6an8 tube as V1 is welcome

Many thanks

K

Last edited by Kagliostro; 15th September 2012 at 12:05 PM.
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Old 15th September 2012, 01:09 PM   #2
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Maybe the most well known:

Click the image to open in full size.
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Old 15th September 2012, 04:45 PM   #3
tricomp is offline tricomp  Denmark
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This boot-strapped version is not so well known but I highly recommend it ...for HiFi that is, I have no idea about how it performs in Guitar-amps.

Otherwise look for Heathkit amps; I believe they used it, too

rgds,

/tri-comp
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Old 15th September 2012, 07:47 PM   #4
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There is mentioned at the schematic you attached as follows:

"(C)/ Tricomp 2011 Free for all non-commercial use"

What do you want to say with this ?
The circuit you attached has been invented some 60 years ago.
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Old 15th September 2012, 09:50 PM   #5
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Here's one from a mid-century console I recently acquired.

Scott
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Old 16th September 2012, 10:28 AM   #6
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Many Thanks to all for the contribute

K
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Old 16th September 2012, 12:52 PM   #7
tricomp is offline tricomp  Denmark
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Quote:
Originally Posted by artosalo View Post
There is mentioned at the schematic you attached as follows:

"(C)/ Tricomp 2011 Free for all non-commercial use"

What do you want to say with this ?
The circuit you attached has been invented some 60 years ago.
So has every other tube-circuit you see on the forum.
I just don't want commercial exploitation of this complete amp., that I built.
The 6AN8 pre-amp/phase-inverter is of course only half of the amp. The rest may easily be found if you search Google with '2C34'.
Yes, I know I haven't the faintest hope of preventing someone determined on exploiting not doing so....

I really don't want you opinion on the copyright but I would love your opinion on the circuit. It's very different from the regular phase-inverter and I haven't seen it used anywhere before in recent times. In my opinion it outperforms the split-load P/I's I've been working with/building.


rgds,

/tri-comp
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Old 16th September 2012, 01:35 PM   #8
jane is offline jane  Norway
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Will the phase splitter be balanced at low frequencies (f<~40Hz) due to the R (40k) and C (100n) in the bootstrap path?
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Old 16th September 2012, 01:46 PM   #9
TheGimp is offline TheGimp  United States
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The copyright only prevents someone from using your drawing. It does not protect the circuit.

Someone can re-draw the schematic and present it as theirs without violating the law.
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Old 16th September 2012, 05:01 PM   #10
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Quote:
Originally Posted by tricomp View Post
So has every other tube-circuit you see on the forum.........

I really don't want you opinion on the copyright but I would love your opinion on the circuit. It's very different from the regular phase-inverter and I haven't seen it used anywhere before in recent times. In my opinion it outperforms the split-load P/I's I've been working with/building.


rgds,

/tri-comp
No, every other circuits here do not have similar "copyright-marking" you used.

The circuit you have "invented" again can be found from Wireless World August, 1947. The article concerning this is: " Push-Pull Phase-Splitter New High-Gain Circuit" by E. Jeffery.
http://livinginthepast-audioweb.co.u...higainsplitter

The same circuit is later published at "Amplifiers, the why and how of good amplification" by G. A. Briggs, 1st edition March 1952, at the page 101 (A high gain phase splitter circuit)

And if I do not remeber badly wrong the circuit is also presented at the "Radiotron Designer's Handbook 4th edition" by F. Langford-Smith, 1953.

And you wanted my opinion about the circuit: it has very bad frequency response and far too high gain for any practical application.

Last edited by artosalo; 16th September 2012 at 05:11 PM. Reason: Link added
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