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Best I remember their serial-number scheme the letter "T" indicates the Taiwan factory. Next digit 4 should mean 2004, next two digits 12 should mean December. The 142nd radio made that month. This means it has the bipolar final and driver transistors, and not the stupidly fragile MOSFET parts...

Darn! Just sold my last parts radio. Decided to "retire" from repairing that model and wouldn't need them any more. They brought stupid money on fleabay though. You're not the only one out there who wants parts. 73

Hey, the desire to modify never goes away, even as the barriers to doing it get higher and higher. Besides, if I was going to risk screwing up a radio with a 'direct' mod, the cheaper the better. 73

And maybe ZoneAlarm overreacted. Better a firewall that's too cautions than one that's asleep at the switch. 73

Welcome to old age. 73

Not so different from cars or trucks made years apart. They never stop tweaking their manufacturing process, and the circuit board will change even though the model number stays the same. 73

Whups! Got a botnet warning from my firewall on that site. Darn! Did let me see it using "incognito" mode. 73

It's a filter capacitor. It serves to smooth out voltage drops caused by loud bass notes in audio amplifiers. The current draw running AM doesn't bounce up and down the same way, so extra filtering won't make a difference you can see or hear. Sideband does create radical fluctuations in the...

Should have two reds and one red with a yellow stripe. The red wires are the 630 Volt secondary, the striped wire is the center tap. The two green wires should also include a third one with a yellow stripe. This is a 12.6-Volt secondary, the striped wire the center tap. The two remaining gray...

Hmmm. 811A, high-mu triode. 6L6, a beam power tetrode, or as the brits call it a Kinkless Tetrode. Not a similarity that just jumps out at me. 73

The illustration above shows the body of the plug is 8.4 mm wide. Pretty sure the spacing between the Hitachi plug's pins is at least 10 mm. As someone once said, one accurate measurement is worth a thousand expert opinions. 73

Seems to me there was a dodge. Used a square-face meter but with the same body outline as the round-face meter. Swapping the 'glass' would fit okay and make the new square replacement meter fit the radio's front panel with the old round transparent window. But that's all I remember about it. 73

No clue. Every list I see skips from 6204 to 6213. No 6210. Odd. What are the three digits before the 6210? 73

I think you'll find the pins are too close together on that one. I'll take a ruler to the cord we keep to use on the bench and see what the spacing really is. Can't remember ever asking that question. 73

The back of that RCA TV said AC or DC on the rear panel. 73

An antenna array in a square 40 miles on a side? HAARP doesn't quite qualify. 73

Wouldn't be the first RCA-branded product built by Hitachi. Console stereos from the 70s with the RCA brand were built by Hitachi. Makes it sound as if Hitachi used the same pinout for a range of products. Don't know any other vendor who used that plug. 73

I would venture to say that this fella and fakebook deserve each other in the most genuine way. 73

If you can find a "non-polarized cheater" cord, it goes onto the side with two pins. The side with 3 pins is for DC power. I have seen a 2-wire cord stripped and each wire lap-soldered to the socket pins with heat shrink slid over the connections. There's nothing to relieve strain if the cord...

I guess we just lucked out. YMMV. And yeah, I did have one GI7B go kapow. The others worked okay. 73