Date: Thu, 2 May 2013 20:16:43 -0500
From: "kingwood" <k5jv@kingwoodcable.com>
To: "Eddy Swynar" <deswynar@xplornet.ca>, "Amp Reflector"
<amps@contesting.com>
Subject: Re: [Amps] 572's
Think back and remember when you mistakenly plugged a 250TL into a rig,
thinking you were plugging in a 250TH. That difference is what I saw with the
last batch of Chinese 572B I had. If the factory gets the problem corrected, I
will continue to use them, as I really do not have a choice, or perhaps, I do.
How about a simple modification to install a single, horizontally mounted,
3CX800A7 in an SB-200, or Yaesu FL-2100? Filament voltage and cooling should
be the only issues of concern. The existing power supply should provide enough
power get around 1,000 watts PEP output. Then, with W7RY?s vacuum relay QSK
system, seems to me, you would be a great little desktop amp. I have been
running a Dentron MLA 2500, modified this way, for about three years (Not the
QSK). with absolutely no problems. My concern with this mod was mounting the
tube horizontally. This has not been an issue, up to this point. Comments?
73 de Lon, K5JV
Lon W. Cottingham
## dream on if you think for one minute that you will get 1000 w pep out of
any yaesu FL-2100B amp. The xfmr in that thing runs blazing HOT, just sitting
there, with fils on, and in standby.
The same xfmr also has a 6,3V @ 8A winding built into it. I have checked
several of em, all new, back in the late 70’s. I sold mine, and bought a Drake
L4B. For the price of a single
3CX-800A7, you could buy a lot of chinese 572B’s. Using a 800w CCS anode
diss tube in an amp that’s ready to blow it’s brains out at 625w out is a waste
of $ and effort.
572B amps, whether in pairs or 4 at a time are table top toy amps...best
relegated to 6m service. Use a real amp with a real tube in it.
Jim VE7RF .
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