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With power disconnected, take the case off and then remove the metal shield that covers the meters, look at the connections to the meters and make sure they are soldered.

I recently acquired an L7 from a Hamfest that didn’t look like it had been used very much, the plate current meter wasn’t working and I found the wire was just pushed through the meters solder lug and had never been soldered from the factory.?

The manual explains how to electronically check / calibrate both current meters without powering up the amp that would be a good troubleshooting start.?

On Jan 6, 2025, at 8:12?AM, Clayton kk4iz via groups.io <KK4IZ284@...> wrote:

? I have a L-7 and neither meter is working. I have not checked to see if ?the watt meeter works.

On Jan 5, 2025, at 10:25?PM, Thomas W9TAB via groups.io <electron@...> wrote:

It’s your HV meter scale adjustment R17 and is also shown on the schematic.?

Use a plastic tweaker.?

How far off is your meter??

Are the other scales correct? (Grid current, Watts)

If not your meter could be bad.?

Here is the excerpt from the manual:?

g.? The high voltage adjustment potentiometer Rl7

is not user adjustable. If this needs readjust-

ment, return the L 7 to the factory for service

Drake knew how dangerous it was to perform this adjustment and didn’t want the user to try to adjust it.?

Tom W9TAB?

On Jan 5, 2025, at 6:21?PM, Jim Shorney via groups.io <jimNU0C@...> wrote:

?
It appears that is your plate voltage calibration pot as was mentioned before. Check it against the schematic.

On Mon, 6 Jan 2025 00:16:12 +0000 (UTC)
"amfone via groups.io" <amfone20000@...> wrote:

In the back of the L7 next to the fan is a small hole with an adjustment control needing a small screwdriver to make the adjustment. I can't find anything in the manual about this, does anyone know what its for?

Thanks?

Tim

WB8UHZ

--?

73

-Jim
NU0C

73’蝉
KK4IZ
Amateur Radio Operator
Warren Bryant?
124 Crestview Dr
Clanton,AL.??35045
Email:?KK4IZ284@...
Cell: 205-389-4170