Testing a grid input circuit

[KC9LKE]

All

I would like to start winding input coils and testing them for a grid driven 2 x 813 class C  amplifier.

I plan to have the bias supply connected, the beam plates connected to ground, and the screen bypass caps in.

Can I properly test the input circuit with my exciter without having the screen and plate supply’s built yet?

Leave the plate swinging in the wind?

TIA

Ted / KC9LKE

[KC2ZFA]

The answer is yes. However, you do have to run the filaments.

Peter

[KC9LKE]

Yes and properly bypassed.

[KM1H]

You can also neutralize them at the same time.

Carl

[KC9LKE]

OK thanks !!

I want to really understand and be able to design tuned grid input circuits. The rest of the amplifier seems easy compared to the different topologies of input circuits. Tradeoffs etc. I have a million questions but will do some “due diligence” and scourer the  board before posting questions about the obvious at this time.

Many thanks and

Best regards

Ted / KC9LKE.

[Opcom]

Please update us on this testing. I was given the same advice to test the RF deck alone, filament only, and it was very useful to fix what ailed it.

[KC9LKE]

Pat:

Sure thing but it may be awhile. I would like to make one more post about the type of circuits that I have found, before I start.
On a positive note… last night I mounted the sockets, wired up the filament circuit and fired them up. I was very late so I turned off the shop lights, opened an 807 and observed the gettering process. After casually collecting parts for three decades it was a thing of beauty!

I’ll keep ya posted.

Best regards

Ted / KC9LKE