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Yes Jim, HV doesn't give you a second chance. ?HV, like the air and sea, is terribly unforgiving of mistakes. ?I have Triplett and HP meters with ?probes and 10KV scales but even so, I don't touch

First thought was that you have the Calibrator button depressed but that should be obvious because you could tune away from it with the VFO. As much as you have been digging around in there you may

Jim so how do I disable the interlocks with the top cover off? And the adjustment pot is on the back panel near the fan cover inside of the chassis or outside and is it hot as in use an insulated

I think it is the hole near the center of the chassis just outside of the fan cover. I suspect they state that it is not user accessible because they don't want anyone messing with it who does not

This is the revised revision of the original revised revision, subject to change, about the L7 HV calibration pot. ? Not sure if it is accessible from that hole between the two coax connectors on the

My memory is failing. ? The HV calibration pot on the L7 ?is not accessible from the rear panel. 73, Evan, K9SQG

Tim, Not sure what to say. ? All the L7s I've owned or serviced had an access hole on the back panel for inserting an insulated tool for adjustment. ?Now the one on the L4B is different though. I

Evan No I have not done that in the manual from Drake it notes " not user accessible" tell me about it. Evan I have purchased many parts for the Drake amps from you in the past and have used them.

You’ve posted a new topic about meter shunts. Please go to the .io group and re-post your question with a new appropriate topic title. Otherwise people researching this issue in the future won’t

----- Forwarded Message ----- From: Evan via groups.io <k9sqg@...>To: [email protected] <[email protected]>Sent: Saturday, January 4, 2025 at 06:53:45 PM ESTSubject: Re:

Tim, Have you already attempted a calibration via the pot on the back panel of the RF deck? 73, Evan, K9SQG

Hello group. I need to replace the meter shunts for the Drake L7, LV and HV reading low. From the schematic Drake used 8 2.3 meg 1/2 watt resistors it appears from the schematic and manual pictures

Jim: Not sure which one is "blown". But all four ceramic feedthroughs shown in the pic are .001 uf/350V rated. *But*.....your HV line (+650VDC) is missing where the unused hole is. Is this what you

Can anyone recommend a subsitute for a blown feed-thru cap that I need ? Appreciate any help Regards W6TTY

yes it was a very pleasant surprised when I turned it on and it worked, The problem I have now id that when i SWITCH FROM lsb OR usB TO cw i get a signal in the receiver 5 over 9 and if I press the

Thanks a lot for the reference, appreciated ! :)

I stand corrected. Rob, NC0B Sent: Saturday, January 04, 2025 6:52 AM To: [email protected] Subject: Re: [DRAKE-RADIO] R4C Sherwood audio mod questions The computed -3 dB high-pass turnover

Hi Floyd, Thanks for pointing that out. I’ll look at the board in my R-4C and see which is correct. It likely doesn’t make much difference with the inverting input impedance. Rob, NC0B Sent:

Well, there ya go! Nice catch. Doesn't it feel good? That is an interesting failure. Just a wild guess but I am thinking the lead had a weak spot, maybe a nick or a spot of corrosion, that caused it

Thank you to all and to Rob especially. This is all very helpful - all gold. Nigel [email protected]> wrote: