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Still another easy way out is to unwind those heavy windings and put in your own center tap. There can't be more than 20, 25 turns of wire per 6V winding?? Transformer secondaries are always wound on

Hi, I've been trying to gather parts for a 3CX1200D7 build. I had trouble locating a sufficient filament transformer. Tube requires 6.3V @ 25A. Ended up finding one for 6.3V @ 28A - Would like to have

One picture clearly shows the the CT bias resistor and the zener diode being switched by a relay (blue)mounted on the center wall. ?The PC board which looks like a relocation of the ALO board might

What I think Lou is saying is...... the cut off bias isn't being applied on RX....( cuz of lousy bias relay contacts on RX)...... hence the tubeS are sucking normal idle current.? BUT if that was the

Lou Below should be my attempt to take 6 pictures of areas that have evidence of possible mods.?? My pictures aren't great - if you see an area of interest let me know and I'll try to get a clearer

Another thing not to be overlooked which is prevalent in many Ameritron amps is a shorted bypass cap on the bias line anywhere along it’s length?.??In rare cases, but possible,?a bypass cap

Running any kind of paper currency or?business card or the like will only help the RF rx side of the switch contacts which are the NC contacts. ?NO or NC contacts on the??armature contacts C on

Not all LK500 amps had QSK and vacuum relay output, it was an option. ?Some had a standard 3PDT relay like an SB220 et Al. ?Even if your amp has a QSK option it’s not working and the previous

Here's the photo of the relays that I tried to attach to my last post.

Steve, Dave, Lou, and all One of my problems is that I'm doubtful that I have a complete schematic for this amplifier.?? Best I've been able to find is from a 1988 users manual I found here (

Very often, all that is necessary is to run a bizness card between the contacts. A card with a particularly-rough finish is great, but don't use a card with an epoxied smooth or glossy finish on one

There are burnishing tools for exactly this purpose. Using finger nail files and files for this purpose is risky, as the potential damage of removing too much contact material is high. I have one of

John, you just might have a worn out contact that switches bias on the antenna relay. ?If the contacts are severely pitted they might not make up too good sometimes and other times ok. ?You need to

Lou, Mike, Jim, Adrian and all, I removed the tubes one at a time.? I let the amp idle (no drive) for 10 minutes with each tube in place individually.?? No signs of anything overheating.? I then

I've already installed, and have been running, the program. But mine is running some 3 or 4 MINUTES behind the amplifier, and since I've seen nothing complaining about that, I'm wondering whether

Mine is the 8410. TNX, Steve K0XP

Jim, it could be ?reflection. The OP didn’t give much information like if the amp works, reads hi voltage, gives idle current if keyed up, etc etc. ?I?agree with you but I’m just trying to get

I believe that the AE9K monitor program works only with the 8410 amplifier.? I have an 8100 and tried the program with it but was unable to establish communications.? I do have experience with using

Lou, on the 2nd pix, it looks like BOTH tubes are going red.? My guess is.... it's a grid to cathode short on one or both tubes. The baffling part is..... his grid and plate current meters are still

Get a hold of glen, AE0Q.? He's active on both the QRZ amp group...and also the E-ham amp group....as well as other alpha experts. Glen answers all alpha e-mail issues everyday.