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Mike, I would like one of the power supply boards. How do I make the necessary arrangements? Bob Coffman KJ7AJ 2drestoration@...

Hi, everyone. I was surprised I found these. This is the power supply upgrade for the Drake L4/L7 high voltage power supply. These pcbs are extra thick with two oz copper plating. They are expensive

Hi, gang, Doing my yearly shack cleaning and I found three of my remote 5 port antenna switch pcbs. Very little documentation, but easy to build. $20 a pop with first class postage mike, wb8vge the

Steve brings up a good point re common mode. I recently spent several hours tracking down the source of 60 Hz hum on the audio output of my R4-C. The hum was objectionable and the 60 Hz sidebands were

*** I suppose one could build a power supply to feed the filaments DC. OR - one could modify the circuit to give the filaments their very own return, and NOT PASS AC CURRENT THROUGH THE CHASSIS. -

Interesting. Sounds like a common-mode issue. I will say that I notice very little hum with my old, beat-up Sony stereo ‘phones on any of my Drake gear. Chasing that stuff at audio frequencies can

Let me add another 2-C with headphone hum. Speaker audio is ok but using a mono headset the hum is disturbing. Even using a Heil Proset the hum is still there but not as bad. Dave KC3AM

Hi Steve...yes, probably the case here.? My 2-C sounds great when using speaker and most of my headphones, but I have a favorite pair of Kenwood HS-5 phones that are very sensitive but allow me to

Wide-range headphones will reveal hum in many tube-type receivers/transceivers. The power supplies aren’t as tightly-regulated as modern 12V gear. 73, Steve Wedge, W1ES/4 Time flies like an arrow.

Hi Jim and Group, I obtained an exact replacement for this bullet axial tantalum, and all is well now, except for some an odd very minor hum problem which I can only hear on one particular set of

Yes, Sir!! joseph n. graif k4jng

Thanks very much, Jim. Not only do I have zero tech skills, but I also can’t even negotiate a freakin’ website. I’ll never know how I missed this… It’s a wonder I can connect my gear

Did you click the "Update Preferences" button at the very bottom of the page? 73 -Jim NU0C "Jim Pruitt WA7DUY" <jpruitt67@...> wrote:

Hi Joe. No,? the option is there for you to check.? I had to go to my account (and pick the down arrow beside my login name). Then over on the left side bar select "Preferences" and at the bottom of

The first three points, and possibly #4, in the attached article may be of help. 73 -Jim NU0C "mjavit01 via groups.io" <MJavit@...> wrote:

Tomorrow I will change out the speaker wire with a shielded wire. Mark

My first guess is RF in the shack… Gary W0DVN

One other issue I noticed, I can slightly hear my voice in my speaker when transmitting. Has anyone encountered this situation? If so are there any suggestions to eliminate this problem? Or is there

I’m very interested in knowing what happens :-) I’ll check the one I’m working on this week. Steve Wedge, W1ES/4 Time flies like an arrow. Fruit flies like a banana. Sent from [Proton

Jim: Thank you for your message. Based on previous posts, it appears there is a switch that determines the fate of one’s own posts, but from what I can determine, it is only available when you first