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*** I have done DeOxit to all the switches and connectors. I really doubt that the "fixed" switch is causing the problem. I could verify that by temporarily bridging it with a jumper. What happens

Wasn't there a statement about "touching the FIXED" switch and the rig would start working? I'd douse the switch with De-oxiT D5 and work the switch before tearing apart the PTO. If need be, you

I understand that the Shure 444d is a good match to the Drakes. They're becoming harder to find, prices are rising, and many have been 'rode hard and put up wet'. What other mics are worth a look,

I really don't have any idea of the production timeline. I have not seen enough samples to nail it down other than the older 1978 service manual version seems to be *mostly* up to date with a few

Jim Where might be those changes from early to late units? I have 9 of these and they have early to late serial numbers. I fix them and "lend" them to new hams. David Assaf III W5XU VP8RXU

You should not have that much noise. It sounds a lot like a grounding issue somewhere as Steve mentioned. You could see if you can isolate it to a specific board by pulling boards one at a time and

I would look at the low pass filter. Silver mica caps have been known to fail strangely as they age. Check the solder on the inductor too. 73 -Jim NU0C "jerry-KF6VB" <jerry@...> wrote:

Jerry: If you cannot solve the problem with the PTO and you are sure that IS the problem, I may be able to help. Contact me off list, but be patient with an answer as I may be unable to get back to

Sigh. Sometimes it just don't pay to get up in the morning. My TR7 loses lock because the PTO output goes away when you tap on the tuning knob. I thought I had it fixed; I resoldered the

Of course, our lives went on past the life of RS. I still encounter the occasional RS Lifetime tube. They have gold-plated pins and I have yet to find a dud from them. 73, Steve Wedge,

Wow. A life time guarantee on 6LQ6 tubes is insane. Doug Free Climbing - The ultimate test of strength and endurance

Patrick, one thing to check is the earthing of the supply and of the oscilloscope. I have seen times where I have picked up “phantom” signals because the scope earth connection was bad. One time,

Sez the guy whose call ends in “SBD” :-D I’d actually prefer putting some prawns on top for 15 minutes. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from

Hi, Sorry for the delay. Thanks for the advices. I've tested my TR7 with an external "laboratory" PSU and saw that the RF signals (LO, BFO, etc...) were all affected by a heavy noise. My scope on

Sweeps were designed for pulse operation. Low average, very high peak power. That's why they can be run so hard with CW or unprocessed SSB. 73 -Jim (no fish were harmed or killed during creation of

*** That was around 1970. I was in high school. Had a lot of fun with that project, and learned a lot. Nowadays, I am much more conservative in how I treat tubes...and transistors!

*** Not at all. Especially if they're nicely breaded. - Jerry, KF6VB

They smell bad when they get hot. Joe WB9SBD

well keep in mind that the tubes were designed as horizontal output tubes for TV sets. That is continuous operation. What kills them is when you exceed what the ratings are and what the manual tells

The front panel, cabinet and copper are a huge determinant. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/) secure email.