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Bob, Glad you found the issue which was along the line of a parasitic, self-oscillation, or frequency multiplying. ? Some of the newer amps have circuitry to prevent incorrect bandswitch positions

I think I now know what caused my major fault.? I was trying to tune up on 15 meters because the Easter Island Dx station was so strong. Problem was it was on 21.262 which is not in the proper part

After a serious full inspection it seems that the only damage was the parasitic plate chokes and the coupling capacitors C39 and 40. I have spare parts coming from RF Parts so should have the amp up

Jim, thanks very much for the explanation on the value of the capacitors. I don't have Tantalums at home but I'll try electrolytics. Regarding the oscillation, I ended up installing a ground strap at

Hi Raoul, I'm thinking the caps essentially follow the resistor color code. Brown-black-blue = 106, or 10000000 pF, 10uF. I could maybe measure one later to confirm. Try this: Slide the cover back on

Hi All, I'm working in my spare TR7 for I found a severe oscillation on 40 meters when using the Yagi antenna. It does not happen with the dummy load and it goes off if I reduce the pre-driver pot in

See: https://pa0cmu.nl/drake.html#bookmark5 "Jim Harris via groups.io" <radiove1rb@...> wrote: -- 73 -Jim NU0C

Thank you Bill 73, Jim VE1RB [email protected]> wrote:

Bob, Thanks for the added info. ?When you said the amplifier went dead I thought all power to the RF deck was lost thus the filaments were not illuminated, meter lights out, status indicators out,

I got the 3296P-1-103LF (10k ohms) and 3296P-1-102LF (1K ohms). They are horizontal adjust which puts the trimmer towards the top of the radio. Just a personal preference. I haven't gotten around to

Operator preference. Use whatever way works best for you. 73 -Jim NU0C

Thanks Eric I have that info saved and have to order sometime soon. Too many irons in the fire. 73, Jim VE1RB [email protected]> wrote:

Mouser: 5 3296Y-1-103 1 3296Y-1-102 73, Bill NZ0T

Here is the thread about the multi turn pot in the TR&s.? Looks like there are some options.? I need to do this to my TR7 as well one of these day.

Does anyone have a list of the pot values otherwise I will go look them all up. Also do you have the part number to buy either from Mouser or Digikey? Thank you, 73, Jim VE1RB [email protected]>

Any other tricks I need to know?? Mount vertical or horizontal?? Horizontal seems better to me.

You, and all of us are in luck, Garry’s wife is still providing the Drake service manuals. Just visit K4OAH.com. Garry used to also provide paper copies but now it’s all downloaded. I got a 2C

You will not regret it. When I do it I measure the existing pots so I can ballpark the new ones before I do the alignment. Makes it a bit easier. "Bill NZ0T via groups.io"

Don't lose hope. They were loud on 10m a little while ago but working EU. I scored Chad for ATNO and two bands yesterday with someone else's L7. This one suffered a flashover in a Chinese 3-500z a

A golden screwdriver even less so. 73 -Jim NU0C "Mike Bryce via groups.io" <prosolar@...> wrote: