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Does the fan run at the same speed all the time or is the speed thermostatically controlled? Bob W4JFA [email protected]> wrote:

You should be able to feel a steady stream of air coming out the side. Sent from the all new AOL app for iOS

Hi all, I'll condense this. A friend just got this AL-80B that had at one time melted a filament tube pin. The tube socket, the type that the socket is on a circuit board, was burned pretty badly. He

There is a one year on Penta through Penta. ? Sent from the all new AOL app for iOS

They done it; here's the BOM listing: 2 CDX-2221-C 3 C1-2 C7 CAP,CERAMIC DISK,0022uF,6KV 20% VISHAY Here's the actual parts listing: CDX-?‐2221-?‐C 3 CAP 2200PF 6K VOLTS 20% .375 L.S.

Those sound like they may be Bell Labs tubes. 73 – Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 Sent: Monday, December 18, 2023 1:22 PM To:

Hopefully someone will help me out.? I have 3? LD-4513 Traveling Wave Tube amplifiers.? These I think operate around 2400MHz.? I would like to get some information on them.? A search on Google

Those are Z5U caps. They are a poor choice for coupling RF with high current.. No wonder they failed. Can't believe Alpha would do that. I have repaired several 8410s and I don't even remember

Howdy Dave, Just as an FYI, Henry Radio (yes, they still sell stuff...) has new "Greenstone" 3-500C tubes for sale. They are Chinese (of course), but seem okay, work well, and are

As a reminder: I just had to replace all three of the 2200 pF/6 kV disc plate blocking caps on my Alpha 8410: But there was no smell when these blew; they just shorted the high voltage, causing a

The AL-80B? does not use real deal plate block caps, but a pair of disc caps.? ?The disc caps are not RF rated either.? ? Any plate block cap needs to have enough pf? so it's reactance (XC)? is

Scott My 922 did exactly what you're describing then I had a plate short.? Plate blocking cap had let go... Cracked and got to ground.? That was the smell. It was only on specific bands too.? I

Jim, I was not aware of w8ji new site, thanks for posting! 73, Mike Mysliwiec KF8OD

On 160m it could be the padder caps? for the tune and load caps.? ?On 10m, it could be the plate choke.... and / or? bandswitch contacts.? ?How old is the AL-80B ?? After W8JI left ameritron in

Does the tube socket and/or surrounding area show any signs of overheating? Bob W4JFA wrote:

The Subject is kind of vague but I have a AL-80B. I have no issues on 75-15m.? The 15M Tuned Input is a little?off, maybe they tuned it to 17M. On 10M when starting tune up process and I get to

I do love FM……Fleetwood Mac, that is ! Sent: Thursday, December 14, 2023 11:06 AM To: [email protected] Subject: Re: [ham-amplifiers] Replacement 3-500ZG

Here is Part 8. The vac tune cap is installed vertically. The vac load cap is also installed vertically. And both have right angle drives. The massive model 90 bandswitch, made by multi-tech

No, but I get all the fame!