How to keep a preamplifier cool in the attic?

[comfortably_numb]

Not the same amp. CM caused a lot of trouble when they used the number 7777 for many different amps.

I like the CM7777HD Amplify. It has high and low gain: 30 and 17 dB.

View attachment 153308

The original 7777 had two antenna inputs; one for VHF and one for UHF. That was my favorite preamp.

View attachment 153309

It was replaced by a 7777 that only had one antenna input.

View attachment 153310

That is the preamp that freeisforme shows in his attic photo. Its gain was stated as 30 dB. CM received many returns. Some users had high signal levels which caused overload. Also it wasn't very reliable; it failed soon. CM changed the design to 24 dB gain, but they didn't change the printed specs.

And now there is yet another 7777:

View attachment 153311

Well, that IS confusing!

 

[primestar31]

Well, that IS confusing!

That's Channel Master for you. They are nothing but a holding company anymore, and keep re-using the same model numbers over and over. It's horrible marketing!

 

[dweber]

I had a channelmaster CM7777HD mast amplifier that I thought had failed. It turned out that the RG59 braid had disintegrated due to weather. I replaced the RG59 with RG6 and everything is working fine.


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[freeisforme]

That's Channel Master for you. They are nothing but a holding company anymore, and keep re-using the same model numbers over and over. It's horrible marketing!

Is that why some of the items have a PCT label?

 

[primestar31]

Is that why some of the items have a PCT label?

PCT International is another company. Channel Master might be relabeling and selling some of their items though.