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Hello Lawrence. I understand your "old-school" project. My Radio Amateur's Handbook, the only one I have, is from 1965. I bought it in London when I was a kid. It really inspired me. You

Francois,Yes, the 3B28's and a resonant choke filter makes things complicated.? The HV power supplies as far back as the '66 Handbook use silicon diodes in a voltage doubler, capacitor input filter,

I think I want to mount an ?LED strip right across the top of the meters and wire it to the 12V rail on the meter board and ground. But what I really would like to do is run 2 LED strips, 1 red and 1

On my SB-220, I have a standby switch and I have the plate meter lamp turned off in standby and turns back on in operate. I wonder if there is a ways to put 2 sets of strips, 1 green and one red.

Lou, can you email me. I’m interested in one of those boards for a future fun project. My Email is good on QRZ. I’ll also try and see if I can private message you here. Not sure how that works but

Yes I still have a couple 2500 power supplies. Sent from the all new AOL app for iOS

Thank you Bill Sent from the all new AOL app for iOS

What he's missing in his head is the fact that power out does double as the plate voltage increases only by 1.414 while the plate resistance stays the same. This used to flummox me, too... then one

I use strip LEDs fully across the top of the 2 meters. ?No problem with RF. ?Run the wire to the 12v rail on the meter board and ground. Sent from the all new AOL app for iOS

Wow, great info from both of you!! lou, do you still have any of those power supply boards for sale? Sounds like something handy to have. I had read about the power supply being in that air cooled

Thanks Lou! placing lamps above the meter is where they should have been. I don’t mind the extra work taking things apart and spending time doing a job. I love working on projects with the Collins

Hi Louis, Thanks for the suggestion. I didn't realize dropping the rear panel was that easy. I hope I don't have to go through this again, hi! And, I did get one of your PS boards for the future, it

When you want to get to the power supply on these amps you don’t remove anything on the RF deck. ?The way to get to the PS is to loosen?the set screws on the band switch and variable caps.

On all the HF2500 amps I buy or repair for customers I install strip LEDs above the meters. ?I don’t want to mess again taking the amp apart for meter bulbs. ?The originals are fuse type bulbs.

Justin, I have a couple of HF-2500 amplifiers I've used for many years and experienced the same failure of the meter lamps. The earlier HF-2500 (single meter) has two bulbs and the later (two meter)

Hello, I have a Commander HF 2500. Have not had it to long. When I got it, only 1 of the 4 meter bulbs was working. After about 3 month, the bulb went dark. I believe there is a 12V 1A regulator

U tube video, part 24. https://www.youtube.com/watch?v=HDo4ck3iGKA

*12 KW CCS on 160-15M.... USING the 3CX-6000A7...... PART 24* Some more progress made. Paralleled mercury contactors and step start resistors installed. Modified step start board installed. Also, a

Hello. I'm 76 years old. I are in my L7 ! I will use a bridge rectifier circuit with 4 x 866A/3B28 tubes. I think you're making things a lot more complicated on this point, even though it's nice