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Hi Guys My two cents on the root cause is that maybe one of the capacitors in the old can was short circuited. Placing a functioning capacitor in parallel will still result in a short circuit. After

I’ll lay claim to having been an engineering tech. I worked as a non-degreed engineer in several gigs. Design work was never my forte. Testing is where I did a lot of work and I really had a knack

Your welcome, John! The antenna switch uses an early stepper motor. I recall that Mike was thinking of making an adaptor that would have allowed use of a newer antenna switch (like a MFJ or some

I may have simplified this… when I was working on the receiver, I tack soldered some electrolytic capacitors in the power supply, still had the distortion. New cap came in, removed the ones I used

Yup, that’s what happened. And of course when I tack soldered in some caps to check operation, I had the distortion. So, when the new cap went in, it’s gone. I’m thinking it might have been a

Many of us ARE engineers, and we appreciate the insights! Being an engineer means that you know enough to know you don't know everything. 73, Gary WB6OGD

Clean the switches. You will find lots of info in the group message archive. I usually use a good non-contaminating spray or a DeoxIT cleaner in a needle tip bottle, followed by application of DeoxIT

David, Consider everyone’s response, so not to be offended — no one ignored you; it may seem that way, though. ? We all learn from all the posts, no matter how much experience we have or

Absolutely. Many of us are non-engineers and appreciate the insight. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent with [Proton Mail](https://proton.me/) secure email.

Success! I now have a fully functional Power Master, thanks to a Christmas light controller that gave up its outlets for my re-purposing. A BIG thank you to Steve who happened to mention in your note

One other thing that needs to be considered in testing some tubes, particularly power tubes, is the impact high plate current can have on readings. Most Hickok tube testers use a single transformer

All things considered the values are reasonable. First, the datasheet value is a target or "bogie" value based on the design and average of production. The tolerance for tube characteristics is

I have a bit of tube background myself. I can state with certainty that variation of +/- 15% is not uncommon. That is why some folks get paid decent money to match tubes to +/- 5%, about as good as

Whoa, wait a minnit, you changed the capacitor and the distortion went away? And its a mystery? Am I misreading this? -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

Richard, you seem to be? knowledgeable about tubes, so please let me throw a question at you. A friend lent me a Westinghouse carton of 5? Westinghouse boxed NOS 6CB6 tubes. All have identical

David, I agree with Gary’s response. I liked your comments. 73, Bill KJ5BNE ++++++++++++++++ Bill Blodgett Arlington, Texas

Whoa David. Not sure what this refers to but I am pretty sure we all appreciate your insight and help. In fooling with broken old radios, nobody has an exact answer, we have to work around the problem

Yup, sometimes you gotta savor the victories! mike, wb8vge

Hi everyone, I wanted to update the progress on my SW4A problems with the AGC causing distortion with strong signals. Over the Christmas holiday, I installed the tri-section electrolytic capacitor I

Great Steve.? I love it when we find a solution and save an old Drake! Darn, I sure wish we could? go down to the store and buy a new tube.? I am suspicious of any tube now, they are all as old and