Category Archives: Restoration

Restoration

The Scott 222C Restoration, Part 3

Welcome back! You can find Part 2 here and Part 1 here.

At this point I decided to load all the tubes up and run a voltage test, verifying the operation of the power supply and the circuit as a whole. Now, the original circuit requires two pairs of matched tubes (ideally a matched quad). I have a modified Eico 667 tube tester which has a set of tip jacks added to it that allow me to measure cathode current while the tube is under test (I’ll give that its own post in the future), and I managed to pluck out two pairs that were close~ish.

I unfortunately have no photos from this testing session, but it sounded… off. Some quick measurements and I was able to get the tubes balanced before running out the potentiometer. Still, I was at the extreme for the bias adjustment and I knew that (a) I wanted to run old-stock tubes without paying $hundreds for them, and (b) new 7189 tubes are expensive!

I put on my robe and wizard hat.

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Repair Restoration Toys In The Attic

Turkey and Solder –or– Busy Busy!

After a whirlwind of activity, a lot of which I need to document here, I’m back online!

First of all, I wish you a Merry New Year and for those that took time off this season. Hopefully you’re back with renewed vigor to tackle that project you’ve had on your mind, or an old project that’s on your workbench.

Me? I couldn’t stop working away. Time off feels is nice; I put my toys aside while working on projects at work, and having time off gives me the time to work on my personal projects. I can only describe it as a runner’s high.

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Restoration

The Scott 222C Restoration, Part 2

Welcome back! You can find Part 1 here.

When I left off, the chassis had been gussied-up and the transformers were re-painted. Before I reassembled it all back together I thought that having the bare-chassis, free from the all weight added by the transformers, would be the best time to electrically refurbish the amp. Charles Hansen ran some excellent articles about completely-redoing a 222C in AudioXpress, and Craig Ostby of NOS Valves was always willing to lend his knowledge.

 

Clean!

Clean!

 

And here it is! All I have to do is test everything…

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Repair Restoration

The Mono Pioneer TX-8100 Problem

A couple years back my then-girlfriend said ‘hey, you fix stereos–I want a stereo!’ And so a Christmas gift was born.

I found a Pioneer QA-800A quad amplifier with a bad channel and lots of DC offset as well as a matching tuner, a Pioneer TX-8100 with a few bulbs out. Both were sold as-is and that was fine with me! I picked them up from the post office and set to work.

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Restoration

The Scott 222C Restoration, Part 1

I bought it in early 2010 described as a fixer-upper, with no photos, and a low price. I was egged on by those more knowledgeable than I, and I’m not one to turn down a challenge.

 

Bought based on this image.

Bought based on this image.

 

Plus, it was my birthday.

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