Complete ST-70 restoration

I just completed a complete Dynaco ST-70 restoration including a new chassis and printed circuit board from Kevin at Dynakitparts.com. The ST-70 was a mess and I was just going to replace the chassis, paint the transformers and replace all the capacitors etc. The wiring was a complete mess so I decided to rebuild the whole amplifier since I didn't want my name associated with the bad wiring....

I reused the tube socket, transformers, choke, and a few other parts. Every resistor has been replaced since there is a new PC-3 board and I replaced every resistor under the chassis. The Bias controls were replaced earlier by someone who redid the poor wiring job.

Here are a few before and after pictures... Just right click each picture and click view image to see the whole picture...

Sal

Excellent work! The transformers look brand new. Was that some sort of chrome finish on the unrestored bells? By the way, I like your bench engraving. Is that from your kids? Mine aren't as kind. My kids made a sign for over my bench that say "Nerdatorium". Anyway, your rebuild is something to be proud of.

Thank you for your compliment, the chassis and endbells were brass plated before I restored the amp. The endbells were powder coated and the cores were sanded, 2 coats of primer and 2 coats of black semi-gloss Rustomleum spray paint.

My daughter occasionally uses my Sharpie marker to write on my bench. Here is another messgae she left me... By the way, my daughter is 22 years old... What can I say.... I'm a cool dad...

Sal 

)

I'm thinking you wouldn't be quite so understanding if she did a few doodles on that shiny "new" amp ...

Nice job, and incentive for dumpster divers everywhere!

PS ... you shot peen the inside or splatter paint?

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Sal...
As always..nice workmanship.

Kevin

really impressed with the way you re-wired everything. my ST70 looks more like yours in its original state as far as wiring is concerned. someday I will rewire it and aim for something like you have done

Thank you all for the compliments.

Sal

Wow!   What a dramatic change for the better.  Excellent job on restoration!

Sal always does first class work!

Best Regards,
Charlie

Very much a "Beauty and the Beast" transformation!