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Steve: Are you interested in an R7 project? I have one that is pretty good cosmetically, comes with the filters it originally came with, no noise blanker, It is disassembled. The PTO is rebuilt, I

I've been considering doing this, after a long stretch of keeping the grids slightly above DC ground. I've also been considering changing the bias to the stack o'zeners. I have a Harbach power supply

I should mention that the TR7 I sold was off QRZ. No commission, I could use my choice in shipping and payment. Yeah, I love it when you can sell at a profit with low overhead. Basically, I enjoy

Curious as to what should actually be expected regarding power gain going from the "floating" grids in L4B / L7 vs strapping the grids directly to ground.? I see 200 watt increase on one L7.

Nice! I put in a lowball bid in that range once on a TR7 fixer-upper from R&L Electronics. I was more trying to stir up some activity than anything else but I ended up buying it. There wasn't much

An old salesman once said "don't charge a fair price, charge what the market will bear". If someone wants to spend that kind of money on a 1-A, that's fine. If no one bites the price will be reduced.

I was really conflicted when I first saw the listing. $250? Scam! Scam! Scam! But I dug a bit deeper ... he put his name and call in the listing and the info lined up with whst was in the ISED

jerry-KF6VB writes: https://www.nobleradio.com/page13.html

I've done this for another application. Check out the Prog Rock from QRPLabs.com https://qrp-labs.com/progrock.html

Why does it bother people when someone knows how to market something and makes a good profit? I don’t understand the mindset. Having said that, such deals come up, even at hamfests. My first TR7

Dear Jerry Hi. It is ready made this : https://qrp-labs.com/progrock2.html I think that I will give it a try to see what it is going. With my best 73's DE Nick SV1VS

Completed purchase today.? Thanks everyone

So your the one who scooped the tr7 package. I tried to get that package and you just beat me to it. Good that someone got it that will appreciate it. Howard VE7IGA?Sent from my Galaxy

I wonder how hard it would be to design a "fake crystal"? Something with a synthesizer chip say an si570 or si5351a and a little tiny CPU to program it? USB socket at the top - you'd plug it into your

Rick W4XA writes: Case in point: two weeks ago I landed a TR-7, PS-7, MS-7, and a Drake desk might of unknown model number for CAD$250. That's about $195 in real money. How did this happen? The back

I'm in total agreement Jim. There's no doubt in my mind that a really nice 1-A would command a pretty high price! And eBay is a great place to sell rare or "one-off" stuff that will always have a

Re: the 1-A.... Keep in mind Country Joe went on the high side of $1000 US for his maybe 20 years ago. They are a lot more rare now. IIRC, the copper chassis on Joe's WAS exceptional. Mine will leave

Be careful swapping tubes in and out. Seal damage can occur with that stress in the pins. DAMHIKT. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from [Proton

I'm looking forward to getting the time to work on mine again. Mine's from late '57 and has no calibrator. As a subtype, it's the rarer of the two (though I would have preferred to have a later one

I got a chance to get back to this project and with the Eimac tubes installed I read the following with amp keyed but no drive. Bias is set by (10) 1N5408 diodes.? HVPS is L4PS with the Harbach board