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Old 10th April 2010, 03:29 AM   #11
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Quote:
Originally Posted by Arnulf View Post
Iron will be expensive considering the power output (it is Single-Ended, not Push-Pull design).
Edcor makes some very acceptable iron at reasonable cost. How much power can you expect from a single ended 6V6? Maybe 5 watts in pentode mode? Try the five watt GXSE single ended output transformer for less than $35 a pair.

EDCOR - GXSE5-8-5.5K

They're decently sized transformers; certainly more beefy than some I've seen scavenged from vintage consoles. Sure, they're not even going to begin to compete with transformers from Mike LaFevre or Jack Elliano. Hashimoto and Tamura aren't worried either. Still, these are some solid transformers at prices that shouldn't be overlooked by the novice. The photo shows them with a pair of noval tubes and sockets for size comparison.

Click the image to open in full size.
http://i69.photobucket.com/albums/i4...E/P1130289.jpg

Last edited by Ty_Bower; 10th April 2010 at 03:33 AM.
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Old 10th April 2010, 05:59 PM   #12
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Why not start with this guy?

RH 84 - Tube Audio ...... RH DESIGN

It is a proven design and if you use an OPT with UL taps you can even try running UL with and without the plate to plate FB.
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Old 10th April 2010, 09:33 PM   #13
rdf is offline rdf  Canada
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Originally Posted by Eli Duttman View Post
Grid leak bias for the voltage amplifier might be viable, but NOT with a 500 KOhm volume control whose wiper is connected to the grid.
Exactly. The OP circuit just looks broken. Best avoided.
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Old 11th April 2010, 12:17 AM   #14
tomchr is offline tomchr  United States
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You could also build a Spud. Three tubes for a stereo amp. I think the total tube cost was $15-ish. $40 for output transformers (Edcor XSE-8-5K), and I think about $30 for the Antek power transformer.

Sounds pretty good.

~Tom
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Old 16th January 2012, 12:50 AM   #15
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Default 5 tube stereo reply

Quote:
Originally Posted by CivicProtection View Post
Has anybody seen this page?
Five Tube Stereo Amplifier

I'm thinking of building my own tube stereo amplifier.
What are your opinions on this schematic? It looks fairly easy to build for me, but what kind of audio quality should I expect from this "push pull" design?

I'd be using this to drive normal magnet speakers. But I'd like to add a headphone jack. I'm not totally sure if the chassis would be HOT. I think it might be. Also I will be using it with my computer's sound card.
yes ive built that amp. it sounds very nice off my computers equalizer. sounds a bit dry off my cd player. it make my grundig mini short wave sound great. i used left and right volume controls only. make sure to vent the chassis. there will be three resistors that get hot. you can play around with your choice of tubes. i used 2 6k6gt and 1 6sn7 and a 5y3 rec. btw, that is a single ended pair of amps.
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Old 20th January 2012, 04:18 AM   #16
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yes. i built that amp already. sounds very good. i use it for netflix and the computer. i changed the tubes to 2 6v6 and 1 6sl7. i like it. its not going to fill an auditorium, but it fills the living room nicely. about 5 watts per. using old university coax 12 in speakers.
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