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3-in-One oil ... one drop. W4DNR Links: ------ [1] /g/ham-amplifiers/message/39535 [2] /mt/101916974/808013 [3] /g/ham-amplifiers/post [4]

Be careful with WD40. It's flammable. I've had good luck with 0w-20 FULL SYNTHETIC engine oil. It also works well for clocks, guns, etc. Bob W4JFA

When I built my 8877 tube tester – I metered everything (four meters). It is amazing to see what happens with a cold 8877 and bringing up the filament voltage via a variac slowly to 5 VAC. A cold

Zoro.com sells tiny tubes of it....

I would also measure the C? between? anode to grid....and also grid to cathode, and also anode to cathode..... and also cathode to heater. Still baffles me why a tube would draw 36% more current.?

Thank you. Yes, air variable. I do not have the moly di grease, but my neighbor has everything. I’ll check with him to see if I can get a dollop. R

Dear Richard, Sorry to hear of your difficulty with a stiff-turning capacitor. I had not seen any prior posts from you describing the component, so I'm not sure of exactly how to proceed. If you

Mine used to turn freely throughout its range, but now, it’s gotten kind of stuff. Annoying. Maybe a shot of penetrating oil on the “bearings,” or what? Richard WB5NEN

Hi Jim, The 36 percent higher current is certainly a head-scratcher, but there are tests for carbonized filament tubes. Some I know: Filament resistance cold -vs- Filament resistance warm (Good

Hal, that does not explain why his tube is pulling 36% more current than normal. Dunno abt the 8877, but typ high mu, directly heated tubes have a cold resistance that's typ 1/10 of the hot

Dear Tim, The 8877 tube benefits from having a filament voltage Current-limiting scheme, such that the initial surge Is limited. A ham operator, some years back, demonstrated That a cold 8877 might

Most 8877 tubes that I test draw 11 amps of filament current at 5 volts. I have tested three recently that draw 15 amps of filament current. All of these tubes are used and have little "dings".

I believe it is essential that you learn how to reduce your images before posting them. Online, your email has the astronomical size of 17.5 MB. Imagine the waste that such a publication will cause.

Wow. dOnT mISPell w0rd here.

Hee hee…!

So, the tubes I have are actually 3CPX1500A7 tubes. These are the pulse rated 8877 tubes. I would like $1800 for all three. They are in their original foam filled boxes. Photos attached. Thanks & 73

Oops, 3CX1500A7-8877. I have two amps with this tube and a NOS spare-not for sale. Alpha 9500 and a Henry 3002A. 73, Dave, w6de Sent: 3 October, 2023 20:56 To: [email protected] Subject: Re:

The Hammond transformers are ordered through Digikey.com .? The price of the? transformer you're looking for is: $404.29 and I assume that's PLUS shipping.? They have none in stock - they're built

Whoops. I made the same mistake. I know what I meant, HI. 73 – Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 848-245-9115 Sent: Wednesday, October 4, 2023 2:47 AM To:

Careful, Mike…..!!!! Sent: Wednesday, October 4, 2023 9:56 AM To: [email protected] Subject: Re: [ham-amplifiers] 12 kw 160-12m amp for sale. Of course you know that he meant