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I have read that years ago, noted it on my schematic. I do find it hard to believe a Drake factory screw up that makes it to not work! I do have my T-4X on the bench right now, I will try to check it

In this article on conversion to 6146's? - http://www.k5dkz.com/t4x6146.html He states the following. This seems like a radical change of value. Is this valid? Exactly what does AGC do? Is this

Yes, finding .156 connectors is easy, perhaps I should've asked ones that are compatible with the originals as far as pin dia is concerned along with the hooks that hook over the edge of the pcb so

Mark, No, tell ron to keep the listing for me. Mike, WB8VGE SunLight Energy Systems The Heathkit Shop http://www.theheathkitshop.com/ J e e p o|||||||o

BTW a 12GN7 while not a direct substitute has the same pinout and is about twice the plate dissipation and higher transconductance than the 12BY7. I could not find one to try but it would be an

I think I have answered my own question. These tubes are basically one and the same. I found quite a few in my stash, and this RCA is numbered with all three types. I ended up using a JAN GE 12BY7A

I'll let Ron know to remove Bob's ad for those boards. He might have forgotten to advise him that they were all sold. Mike, should I remove your boards from the parts & service doc on his site? 73's,

Looking for a Excellent top cabinet if anyone knows where I might find one. An excellent original R7A manual would be nice too. Marty KL7AM

Mike, FYI in Drake parlance this is known as the "Jumper Board" and is described as such in the TR7 service manual. 73 -Jim NU0C "Mike Bryce" <prosolar@...> wrote:

I don’t have the answer to that. I did, however, throw out some carbon resistors recently (and I’m in an ongoing process with my stock, which dates back decades) that were grossly out of spec,

Steve, I agree. This is more of a temporary fix for me. Once I get everything working I will go back and replace them with new parts. What I don't remember is what is the drift profile of carbon comp

This is a standard sized wafer that has a quirky difference from a standard 2 pole 5 position wafer. The Common for one side is in the middle instead of at one end. You get around this by drilling out

Those are the boards that I have and they work very well. 73, Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from Proton Mail for iOS

That is also an advantage. Slightly OT, general purpose grease on the PTO bearings is what Drake used and its use also helped keep those 10 balls in place during reassembly. 73, Steve Wedge, W1ES/4

The problem with that with respect to the cathode and screen resistors is that the out of tolerance parts will continue to drift out of tolerance. It’s best to use new replacements of the original

dave and the group, finding .156 connectors are easy—digikey and mouser have them by the millions! However, you need to know the series like KK or KW, KS, the pitch. Do you want locking tabs? What

Can anybody tell me where to get the .156 connectors from please? Thanks Dave G4FAW

Steve & Joe, I was suspecting that oiling the bearings could cause slipping. However, both of the veriers I have were packed with a thick grease. So, I will follow Steve's recommendation and try some

Gary, That is my plan. I am going to stop at Harbor Freight today and pick up an 8 in C clamp. I have been thinking about how the assembly should go. My theory of the moment is that the preload

Since I have several boxes full of resistors, I have simply been measuring the starting resistance and calculating what parallel resistance is needed. I trimmed the meter shunt to 1% and matched the