LA2A build - No Gain Reduction

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shaker

New member
Joined
Aug 15, 2014
Messages
3
Hi there,
I've built an LA2A with sowter tranny, set up for Australian power, 240VAC.

I can't get the unit to GR. All my voltages on the 6AQ5 are wrong... compared to the schematic that I'm using from Recproaudio.com.


I've check my wiring against the schematic and cayocost 5/15/05 multiple times and I can't see that I've missed anything.

The R34 I have used is 10kΩ/2W. Others have used the 22kΩ UA style revision. I don't think many people have used the Sowter Tranny... and I wonder if something is different there.

I've changed all the tubes to see if that was the issue with no luck. I'm testing component is and out of the circuit.
I'm a bit stumped.

Also, I have 3 different optos. 2 brand new kenetek and one NOS T4B. Still no change.

Any suggestions as to what could be wrong?

regards,

James
 

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