45 amplifier

[neazoi]

Hi I am looking for an amplifier schematic in class A1 using 6sn7 and 45 tubes.
I am interested in Single Ended topology or Parallel Single Ended.

Please post anything you have got,

Thank you very much.

[kmtang]

Hi,

You may use the Sun Audio's 2A3 schematic for use with the 45 tube with only modification of the cathode resistor from 750 ohm to 1.5K. It employs 6SN7-6SN7-2A3.

I trimmed the B+ to approx 310Vdc with double LCLC B+ filter. It sounds very nice indeed.


Johnny

[neazoi]

Thank you.
But I cannot find the schematic anywhere... ??

[mg16]

Hi,
I built the project outlined in Glass Audio magazine (3/95).
"Single ended glory for under $100" by Eric Barbour.
His cost assumes a well stocked "junk box". It cost me about $400.
Mr Barbour is a tube circuit designer for Svetlana tubes.
His 45 amp uses 6sn7 input, is simple and sounds fantastic in my opinion.
mg16

[neazoi]

Thank you all for your replies!
The thing is that I need a schematic and maby some notes about the transformer for both single ended and parallel single ended...
Because I do not have these magazine issues..
anyone please?

[EZ_Angus]

Here is a link to an article by the designer about how he put together a 45 amp.

Gordon Rankin's Bugle

[neazoi]

Ok, that sounds like a good deal.
How about this one?
http://members.myactv.net/~je2a3/simple45.htm
Is it worth it?
It seems a quite easy to build design...
If more gain needed I could use another 6sl7 to add a third stage.
Could an 6sn7 be used?
Any other schematics?

[MartinV56]

Hi, view this circuits

Sun Audio
JE Labs

[MartinV56]

JE Labs

[neazoi]

Thank you for the circuits.
As far qas I can see not many differences to each other.
Relatively simple signal path and psu. Easy to construct despite of the costly tubes and transformers..