I'm looking for 6an8 (as V1) schematics

[Kagliostro]

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

[artosalo]

Maybe the most well known:

[tricomp]

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

[artosalo]

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.

[scott17]

Here's one from a mid-century console I recently acquired.

Scott

[Kagliostro]

Many Thanks to all for the contribute

K

[tricomp]

Originally Posted by artosalo

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

[jane]

Will the phase splitter be balanced at low frequencies (f<~40Hz) due to the R (40k) and C (100n) in the bootstrap path?

[TheGimp]

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.

[artosalo]

Originally Posted by tricomp

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.