[Motorola] RE: Motorola digest, Vol 1 #470 - 4 msgs

Thu, 22 Apr 2004 09:58:32 -0700

Well Glen, I see from your experience you have worked around many of these amplifiers.  Did you by chance save any of the paperwork associated with these pieces of equipment?

One note on the model numbers for the TLD6610 series though, in my documentation it shows the TLD6611A being for 136-150.8 MHz and the TLD6612A in the 150.8-162 MHZ range with the TLD6613A setup for 162-174 MHz.  I was able to add a bunch of capacitance to the plate line and swamp it down to 144 MHz.  Not real efficient, but it works!

Most of this equipment, with the exception of the newest acquisition (dual tube low VHF band), came from Gillette, Wyoming and was used by Mountain Bell as mobile phone base station amps.  This is inscribed on several pieces that I have.  I also have 3 or 4 of their associated power supplies (small version) in the attic.  I think I still have 1 or 2 of the meter panels up there too.

At any rate I will keep searching for information on these amps.

Thanks,
John
KA7CVJ

--__--__--

Message: 1
Date: Wed, 21 Apr 2004 06:03:05 -0700 (PDT)
From: Glen Zook <[email protected]>
To: [email protected]
Subject: [Motorola] Motorola Tube Amps
Reply-To: [email protected]

I owned the Motorola reconditioned equipment center
for the south-central United States from 1970 until
Motorola went out of that end of the business in 1979.
 We reconditioned equipment for a 14 state area,
everything reconditioned that was exported, and
everything that the U.S. Government bought
reconditioned (was the "height" of Viet Nam and the
government did buy some reconditioned equipment!).

Thus, there is very little (if any!) equipment that
Motorola built from the 1960s until 1979 that I
haven't seen.  Actually, since we got in all of the
trade-in equipment that Motorola received, I saw some
pretty old equipment not only of Motorola manufacture
but from every other manufacturer as well.  Of course
the newer "foreign" (Motorola called anything but
Motorola "foreign") equipment came in as well.

As far as I know, Motorola never built anything with
the 8122, but they sure liked the 8072 on UHF!

As for the 4CX250 "B" series 100 watt UHF amplifier: 
I believe that the problem may have been in the
bandpass filter that was in the output.  I have an old
"B" amplifier that I use on 432 MHz CW from which the
bandpass filter has been removed.  I consistently get
150 watts out of the amplifier using the "normal"
power supply.  The power doesn't fall off like it does
when used with the bandpass filter in the 450 - 470
MHz range.

We shipped almost as many "single ended" 8560A units
as the "dual" 8560A units over the years.

Glen, K9STH

--__--__--

Message: 3
Date: Wed, 21 Apr 2004 13:46:19 -0700 (PDT)
From: Glen Zook <[email protected]>
Subject: Re: [Motorola] RE: Motorola Tube Amps
To: [email protected]
Reply-To: [email protected]

Your lowband amplifier was originally made for the 42
- 50 MHz range.  That is indicated by the harmonic
filter number.  Of the TFB6014A the "B" indicates
lowband and the "4" indicates the 42 - 50 MHz range. 
if it were a "1" then the radio would have been for
the 25 - 28 MHz range, a "2" for the 30 - 36 MHz
range, and a "3" for the 36 - 42 MHz range.

The highband TLD6613A the "D" indicates highband and
the "3" indicates 150.8 - 162 MHz.

Glen, K9STH

--- Kinney John-r17512 <[email protected]> wrote:

It does have several part numbers on different pieces,
i.e. TFB6014A Harmonic Filter.

I have 2 of these amps (TLD6613A) that I scooched down
to 144.200 MHz.

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25� http://photos.yahoo.com/ph/print_splash

End of Motorola Digest