Another TVA1 - KT88 power amplifier

[apnneto]

More photos

Soft starter from Soft-Start Circuit For Power Amps and DC heater supply from this forum.

 

[BigE]

where can you get OPT for these? thanks!

 

[apnneto]

I tried 3 OPTs. The first one was 5k without UL taps. I didn't liked it. The second one with UL taps (5k) and 0-4-8 on secondaries, 70w. Very good. The last one was a Hashimoto HW-100-5. This is a big OPT and sounds very well. I changed, for each one, the feed back resistor.

 

[apnneto]

Now, the journey is ending... She is working very well. Nice sound and strong bass. Some more pictures.

On output transformer, I started a thread being discussed in this link:
http://www.diyaudio.com/forums/tubes-valves/268876-output-transformer-windings-parallel-2.html

Today I will enter in maintenance mode. The scope will be used to tune the amp (feedback loop). I ordered the transformer cover and I'm still trying to figure if I will use a passive preamplifier with remote control or just a power button.

Next, a updated components list and some chassis dimensions.

So, what's up for today? Guess what .. some beers ... and enjoy some of this nice amplifier ...

 

[jazbo8]

I like the stacked donuts...

 

[apnneto]

Thanks ... saving some space ...