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Next project up: 12ax7/6aq5 SE amplifier

gearhound

gearhound

Lunatic Member
Unlike the 1.5wpc flea amp (6au6/12b4a) I managed to bang together, this SE amplifier will (should) produce a mind boggling 4 watts-per-channel.
Sorry PP fans, I just happen to like SE amps a wee bit better?
The schematic came from Wade's Tube Audio site, and is based on an SE Zenith amplifier schematic, that Wade revised (I hope I got that part right?).
Anyway, I've been scrounging around for parts today.....and so far.....
A pair of NOS RCA 6aq5a tubes.................$11, delivered.
A NOS CBS/Jan 5y3gta rectifier tube..........$12, delivered.
Hunting around on flea-bay this time around proved fruitless, as far as transformers were concerned?
Eh.....you win some.....and you lose some.
Anyway, biting the bullet at the EDCOR web-site, produced a power tranny and a couple of SE OPT's...............................$120, delivered.
With the exception of a few odd caps and resistors, I should have everything else here in the trash shack (.....there's no place like home.....there's no place like home.....there's.....don't lift that leg Toto....), to doom.....er.....complete the project.

We'll see.....................

And yeah, I know the drill already.....pics will be forthcoming.


Steve :scratch2: :yes:
 
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I saw the schematic for the 6AQ5 amp a few months back. It looks nice. Keep us posted on progress and how it sounds.
 
Please indulge me a stupid question....

As I look at this schematic and also the 6BQ5 and 6V6 SE builds from Wade's site, I'd like to clarify some of the notation.

"5K6" or "1K2" means 5600 ohms or 1200 ohms, right?

And can I safely assume that unrated resistors are 1/2 watt unless otherwise noted?....:scratch2:
 
Yeah, I wasn't sure which one (6BQ5, 6AQ5, or 6V6) of Wade's SE amps I wanted to do at first?
Decided on the 6AQ5's for economical reasons, more than anything else.
NOS 6BQ5 and 6V6 tubes are a lot pricier than the lowly 6AQ5 tube.


Steve
 
Zenith used just such an SE amp in the early 70's in their LPS-80 record player.

2x 6AQ5A
1x 12AX7A
1x 6X4

Just the cutest little output transformers you ever saw.
Somehow they tied an oval woofer that mounted in the case to both channels, gotta be great for rumble.

HPIM0322.JPG

HPIM0323.JPG
 
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