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Good quality coax. With SHV connectors.

Akek, That worked! Thanx. My Kenwood has a soft start in it already (Kessler). My Henry (2K-3) about once every three months will trip the breaker when turned on. I can live with that I guess. The amp

Hi Bob Search for 100A 4000W High-Power Soft Start Circuit Power Board for Class A Amplifier Amp 73, Alek.

In the soft start device I'm talking about, it gets switched out of circuit by the 100A relay, just like the resistor in a normal slow start. Alek VK6APK

The SB220 has a separate filament transfomer but since the line feeding it and the plate transformer is the same, any sag on the line voltage due to plate primary current drawn by the plate

I have mixed emotions about NTC resistors.? I tried one on my SB-220 and found that the resistance would change between idle and full plate current.? The large current change caused the filament

Alek, Angus, I couldn't make those ebay numbers work but if you do a search on ebay for "NTC resistor" you get several. I had to use one in my 50 amp Astron (RS-50) linear power supply. It would

G'day Angus. Sorry for the delay. I missed your email and I'm just cleaning up my emails and noticed this one. Yes, the NTC works. I use them in this form for a lot of amps that I build. See Ebay Item

I’ll take a look at this, thanks a bunch.

SHV connector is ....'safe high voltage'.? It's basically a reverse gender BNC connector.? ?Typ rated for 5 kv @ 2 amps. A HN connector is a ...'high powered N connector'.

Here is some info about the TU-6B board designed and sold by W7DS (SK). I was able to source a board from a guy on e-bay, but I don't think he has any left. Hope this helps.

Lower the screen voltage on the radio not the amp to lower the drive to the amp.

Pad the input to the final tube? Lot's of ways. Good luck. Listening on 10 on my 50 year old Siltronics 1011C. Memories from High school.

All- It's a grounded grid triode amplifier - three 3CX800A7s. Many thanks, -Mark [email protected]> wrote:

Any chance you could lower the screen voltage? Assuming it's a tetrode or pentode. A string of zeners?

All- I'm willing to accept the 3 dB on receive, although it is not great. I have a separate question on the Swan forum to see if there is an easy way to put an RF output adjustment on the radio. I

If you do use an attenuator, which I do here for one of my amps, you will have to find a way to bypass it in receive or you will have 3dB attenuation of the receive signal. Sent: Wednesday, November

All- Thank you for the information. I do not recall having a spectacular failure like that, but perhaps the person I loaned the amp to did. Regardless, it still appears to be working. Thank you for

FWIW, I have changed those series resistors on those amps quite a few times before. ?They are rather small resistors and are probably sacrificial to save the meter in a fault.? ?? Sent from the

Plate/Grid flash over. With a manual tune amplifier, a likely suspect is a band change and failure to tune the plate and load at low power. Another way is returning to from a break in operation then