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Old 07-09-2010, 06:39 AM
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VintagePC VintagePC is offline
Tube bug got me 05/2010
 
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I've also thought about refinishing the cabinet. There are some nice pieces of solid maple, but the rest seems to be made of hardboard. It's all coated with some horrid brown paint-on coating that is peeling like crazy.

I'd thought to strip it and put on maple veneer (and varnish it) instead. Can anyone with cabinet work experience advise on the best way to do this?
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Old 07-12-2010, 09:59 AM
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VintagePC VintagePC is offline
Tube bug got me 05/2010
 
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Okay... some good news, some bad. The good news is I've borrowed a variac. The bad news is that I borrowed it as-is, and unfortunately, it seems not to do anything.

Looks like I'll have to fix it before I can fire up the radio. I've already done the background research and have figured out that it's either going to be a simple fix, or not at all. Fingers crossed!

Last edited by VintagePC; 07-12-2010 at 10:09 AM.
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Old 07-12-2010, 07:25 PM
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VintagePC VintagePC is offline
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Some even better news... The variac just had a funky switch, and is working now!

I've done the preliminary non-rectifier tests, and all seems well so far- transformer didn't even get warm, all of the tubes lit up, and both the dial lights lit.

I kept the voltmeter across the filament line, and it's bang on at 6.3v AC.

(the occasional twitch to 6.4, but I expect that's because the wall voltage is 120V as opposed to 117 the set wants.)

I also checked the chassis to ground voltage, there's about 33v AC, so no major shock hazard.

I also probed the HV out from the transformer, that's at about 500V AC.
It seems a little on the high side, but I still live in a silicon world where rectifiers are that efficient

It's getting dark now, so I'll wait until tomorrow to put in the rectifier and do the secondary tests. Pictures of that warm tube glow coming soon!

Edit: Pics posted in the build log. Here's one to get you started...
Attached Images
File Type: jpg IMG_1203.JPG (20.3 KB, 7 views)

Last edited by VintagePC; 07-12-2010 at 08:05 PM.
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