seti

I just got a really nice Intact Audio Stereo Autoformer Volume Control....

My friend and I finished another pair of amplifiers. These were a real mission. I spent so much time on these. They are supposed to be 90wpc which they are but they clip like crazy. They are super clean up to 75wpc. 2 x 5ar4, 2x od3, 2 x 6sn7, 2 x kt90..... There was a 12au7 preamp stage but we ripped it out. We add JJ and Hayseed caps and also two test points and pots for setting bias. They are still pretty much Allen 90 organ amps but with a beefed-up power supply.

If it is the EL84 101 I would have it restored. I did mine and it might be the best sounding vintage piece I have. It is so good and stable. The only thing left are those nast ols rca jacks. Good luck that is a great piece of gear.

You were the first to push me towards DIY. THANKS!

The hum could be circuit or transformer laminations or maybe both. Yeah we still got some work to do. I'm optimistic we can knock the hum down. You know how it is when you just finish a big build and your just amazed any sound comes out at all. That is how I am anyway. I'm curious about the actual power rating and distortion measurements. That should follow.

I don't think it is being pushed too hard as it is running lower voltage and current than spec. It was over 600v now it is 550v. The 0d3 cuts the voltage to the driver stages to around 300v. We even removed a preamp stage then installed a larger potted choke. All the caps are cool after an hour of running. All the transformers and chokes not even warm. We are going to do some distortion and power testing and then try to find the hum. I can't tell if it is 60hz or 120hz right now. I've never had a tube amp this powerful. My bench speakers are 84db1w1m if I hear hum on this I'm scared of 107db 1w1m..... This was something I had to get out of the way. If I can get it to a point where I am happy with it I might ebay or audiogon it so I can buy parts for other projects. Thanks!

Thanks I also forgot to mention they are dated June 1958. 65yo....

I bought these monoblocks many years ago from a Little Rock Central High School teacher. I sent them to hot glass audio for a rebuild. Anyone who remembers that con knows it was a miracle I even got them back. He broke all NOS tubes in shipping. I sold them to my brother because I was frustrated but he just sold them back to me. The nightmare continues. I completely gutted them and rebuilt them from scratch but I did have professional help. I added bias adjustments removed a 12AT7 preamp section and upgraded power supply with a beefier choke and caps. The power tubes switched from, 6550 to KT90's which are from the collection I inherited from Daddy Dee. Thanks again to Daddy Dee. The tube compliment is 2 x KT90, 2 X 5AR4, 2 x OD3, and 2 X 6SN7. They sound really good when turned up but still a little transformer hum to work out. I need to tighten them down. Not sure I need freaking 90 watt amps.

Just looking at the position of the speakers and the substance of the room. That room is hideous. Speakers not in corners. Pathetic setup.

For what it is worth Sovtek and EH are monoplate 2a3. Price a vintage 2a3 monoplate and you will understand lol...

The sale and liberal use of old tube brand names is disingenuous.

Find a faux painter. I have a friend who can paint any veneer. A good faux painter can make scratches or damage dissappear.

Awesome!!!!

Funny thing is I think I am the one that posted that lol....... Thanks

What time does this start on Friday?