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No, I did not. I will get around to that when I get the amp on the bench. I was more interested in the performance of the circuit in place so I was measuring referenced to the chassis. I will note

For issues like these, the tube tester isn’t very useful, as they test either at DC or at line frequency. Especially for low-gain at higher frequencies, substitution is the only way to go. Steve

Ok Steve I think it's worth passing this on to him.? Thanks for the added info.? I did check all tubes before bring it to him, but anything is possible and sometimes it does turn out to be that

There is also a small chance that the driver tube is going bad. Strangely, I’ve never seen a bad one with Drake equipment but Kenwood owners seem to have them fail more. All tubes eventually “wear

Did u measure the total uh with a digital lcr meter ??? ? That is what I would like to know.? ? As long as the plate choke doesn't series resonate near a ham band, it will.....'work'.? ?Without

Steve Wedge, W1ES/4 ( /g/DRAKE-RADIO/message/77513 ) 4:53pm #77513 ( /g/DRAKE-RADIO/message/77513 ) "Peter, it is fairly common for these tubes, as they approach

Peter, it is fairly common for these tubes, as they approach end-of-life, to have lower power output on 15 and 10. Even with fresh tubes, you can expect around 150-175W out on those bands and that is

My tech messaged me yesterday about my TR4cw/rit.? I brought it to him for a "going over" and alignment if it was in need.? I've owned it for 2 or 3 years but never used it.? I had it on the air

I seem to have found the holy grail of plate chokes in the Alpha 76 that recently came into my possession. The original choke was re-wound years ago by a Hy-Gain (Telex) lab technician and fellow ham.

Did you check the grid metering calibration? IMO that is a must-do for any amp with an unknown history. In my limited sample of three they have all been off. 73 -Jim NU0C "Jake KE8VGU via groups.io"

I had one of my L4B's apart yesterday. The plate choke measures 157.34 uh. Hooked up to the VNA, it series resonates at 16.464 mhz.......and also 23.373 mhz.? ?On paper, the choke should work on

Hello! I have been restoring a Drake L4-b for the past year or so. However, my amp is not making power, and there's no grid current. Since it's been a while and I didn't take notes, I'll do my best to

The plate chokes in my L7 are copper with a coating of some type but can be soldered well. I have not put the Metal Oxide resistors on them yet and still using amp at a lower power level that is

Hi Mark, I tried jumping in there Sunday afternoon but conditions were terrible, I could barely hear you here in Massachusetts. Hopefully things will be better next week. I was running my "B" line by

Not so sure of this. I think aluminum can be soldered using aluminum solder and a flux like borax. A problem with aluminum is that pure aluminum develops a layer of oxide almost immediately. The layer

You can't solder aluminum anyway.

Yesterdays net was held on 7.238?@ 4pm Eastern. We had a total of 27 check-ins. The following list of radio's were used: TWINS = 4 TR3 = 1 TR4(x) = 9 TR4 = 2 TR7 = 6 Our net control for next week

Message /g/DRAKE-RADIO/message/77423 . "K6OXN Bob via groups.io" <bobk6oxn@...> wrote: -- 73 -Jim NU0C

I did not see the referral for that article but have now studied it and think I might use the MOF resistors I have. I have several 100 ohm 5 watt resistors, I think I will place in my L7 and see how

Did you read this link that I posted previously? https://amfone.net/Amforum/index.php?topic=45450.0 "K6OXN Bob via groups.io" <bobk6oxn@...> wrote: -- 73 -Jim NU0C