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Oh, gosh! Poor babies! Hal Mandel W4HBM

They look like 6360s, 10 watt push/pull VHF PA tubes. I can’t be certain, though. Best regards Mahlon - N4ZK [email protected]> wrote:

These tubes were literally dug up last weekend at a former "VHF Telegraphy" commercial site in the UK. Does anyone recognise what they are ? Ideally I'd like to know what equipment they were used in,

Indeed, by increasing the input power, it outputs more. · 21.200 MHz 40W -> 700 W 470 mA 12.4 dB 2250 V · 7.100 MHz 40W -> 650 W 450 mA 12.1 dB 2250 V We are no longer in a linear range since up to

25 watts is NOT enough drive to get the load control up of full capacitance. ?You need to drive the amp with much more power. ?Once you head around 50 watts the load control will begin to go higher

It seems like the output circuit is off? The higher you go up in mhz the better the efficiency gets. can you see what it looks like on 15?

Make sure the input circuit is lined up with the proper output band. On the input side, it seems fine. I'm driving L7 with an FTDX-3000. I performed a TUNE, forcing the RLY relay to close, and I have

Make sure the input circuit is lined up with the proper output band.

I’m working on a pair of L7 amps right now and will be testing them today. I would like you to publish the results of your investigations. I cannot get more than 400 W out even when over-exciting

You don’t want less than about 160ma idle current for SSB and no less than about 100ma for CW or else it will require a lot of drive to get the amp up to a decent output. ?You can drive those tubes

Hello I've already presented the refurbishment of this L7 amplifier here. I implemented a cathode bias and connected the grids directly to ground. I noticed that, regardless of the bias, I can't

Harbach Electronics has started their own FB group. "This is a place for people to post pictures of their Harbach kit installs, Homebrew ham pa projects and brainstorm ideas".

That’s a SB-1000. Just showing the dirt on the strip that I pulled off the relay.

Hmmm alright. That doesn't look like a Commander HF-2500 with 3CX800A7s. ?

Hmmm, the relay is right there? I do want to clean the relay. I cut strips of paper, saturate them with DeoxIT, and clean the tint acts on the relays. They are almost always dirty.

No. Just remove the rear panel screws and fold the panel down to get to the relay/s. There's also the relay on the control board. Cheers, Alek.

Well, my goal was to just have the meters red in standby and green when ?out of standby but the 1 set of the poles are bad on the 2PDT standby switch. I don’t want colors changing between TX and RX

The solution is simple if you want the colours to change between Tx and Rx. Install another small SPDT relay in parallel with the keying relay and wire each strip through the contacts. 73, Alek

I guess the 15sec videos are not allowed. I’ll try to add a pic when I get home but it’s pretty cool.

So I installed 2 LED strips that draw 66mA each. I tried to utilize that standby DPDT but the one set of poles is shot. Anyway, I’m just running both strips, red and green. I may drop the voltage to