[VHFcontesting] AM-6154 amp - thoughts?

Dave Olean k1whs at metrocast.net
Mon Nov 5 11:10:10 EST 2012

If anyone is interested I have three AM6154/ AM6155 that I want to sell. 
They are all converted (by me). Two are on 144, while the third one is on 
222 MHz.  They all have good tubes. In fact one of them is brand new and was 
"donated" by W6PO and it has "Engineering Sample" printed on it.  In my 
experience the AM6155s like to be run at about 300 watts out. Driving them 
harder just makes them splatter more. You can get more especially on 144 
MHz, but I would not push them. They will run at 300 watts all day.  I like 
to describe them as MIL Spec ham gear.  Price is $150 each.
Dave K1WHS

-----Original Message----- 
From: Chet S
Sent: Sunday, November 04, 2012 10:59 AM
To: 'steve d' ; 'VHF Contesting'
Subject: Re: [VHFcontesting] AM-6154 amp - thoughts?

These are wonderful amps- high quality design and construction. I have three
of them, one waiting to be converted for 222 and the others in use on 2M and
70 cm.

But they are HEAVY and the blower whines loudly. I've built a rack on
casters for them so that I can keep them in the next room when operating a
contest. Once tuned up, they need no adjustment.

Yes they can produce 400W output but according to my analysis that
overstresses some components (like the tube). Since I contest in the low
power category, overstressing them is not an issue for me, and they do what
I want at lower output- they just run and run and run. Outside of contests,
I've used the 2M one for meteor scatter at 200-250W continuous output for 30
seconds every minute with no problem.

If I remember, I bought the already converted to 2M one for $300 without T/R
relays many years ago.
The 432 unit was an eBay junker for under $200 about 2-3 years ago
And bought another 2M one this summer at a flea market for $150.

Chet, N8RA

-----Original Message-----
From: VHFcontesting [mailto:vhfcontesting-bounces at contesting.com] On Behalf
Of steve d
Sent: Saturday, November 03, 2012 11:22 PM
To: VHF Contesting
Subject: [VHFcontesting] AM-6154 amp - thoughts?

I have an opportunity to purchase a ready-to-go AM-6154 (or 6155?) amp for
2m. I have read up on them a little bit and everything I have found has said
they are quite robust amps. The owner/operator claims 400+w which is right
in line with what I have read up on. It is out of an operational station.
The price is pretty reasonable from what I can tell.

Compared to other options, given the opportunity is there, is there anything
I should be aware of? Or is it really a great opportunity I should take?

There's also several hundred watts available for 6m (home-brew unit) so I
might dive in to that also.

Steve, KC8QVO
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