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I have two of these that preamp works with power off. One is the DSS, the other is Firebird. Both have two DPDT relays.

Hi Dan, I did search, but found nothing, so thanks for sending it. SL

Bollocks!

What you are saying in regard to device tabs, being band specific, is just not the case. 2SC2097, 2SC2904 are examples of this configuration.

Hi Dan, I am looking for CB-14, Comstat 19 pages. Would have that? Thanks, SL

Some variants of that amp, have the ability to turn the preamp on, when the power is off. Some don't.

I see a thing of beauty evolving before my tired eyes.

My 2 cents. NO SWITCHES!

Astatic or MFJ? Seriously? I wouldn't admit to that, in this forum of esteemed individuals :)

Check this out. Simple enough, but effective.

It could be the preamp transistor or a relay You need to figure that out. If you looking at the amp from the front, the preamp relay is on the left and you'll see a small transistor and a metal can that is your preamp transistor.

It's $100 amp. Get a better amp.

Mind you, the transaction was in 2021. I was not pleased, at that time and did request a refund, that I did receive.

I believe it was a different seller.

The eBay photo showed a legit part. what I got, was something else.

I doubt it will. The amp in the video, has M1104. This part is the VHF part, used in Maxtrac, Maratrac, GM300 mobiles.

It is the same amp as many others, that use a different name.

I had a look at the base assembly. There is a pin (rivet?) that goes through the insulator. Perhaps this is the connection? I am going by online visuals, so I can't be certain. The obvious telltale, would be to ohm it out. I also looked at the specs on the Sirio store, that also state DC...

I would power the receiver from a battery and turn off the main breaker, if it is suspected to be a source, within the house. It would be more important, to first identify the type of noise, before trying to locate the source. It may not be in the house at all.

As far as I know, the Sirio Tornado is DC grounded. It utilizes a shunt coil match, which is electrically DC grounded.