[NJARC] Re: Amp that uses 7027A's, Re: NJARC digest, Vol 1 #398

[Al Schapira]

Bill wrote:

>> What kind of amp uses the same toubs as a ranger II other
>> then a McIntosh 240?
>> 
>> Bill Overbeck

Its a Bogen-Presto Co., Division of Siegler Corp., Paramus, NJ,
Model CHA 75A, Challenger Series F110, 75 watt Public Address Amplifier.

The one I have to sell has a black chassis with perfect white lettering,
but 2 of 5 knobs are not original. It is 17" wide x 11 1/2" deep x 7"
high, about 26 lbs.  To reiterate, one of the output tubes (7027A) is
BAD (gassy with blue glow) and the other is a 7027 (not a 7027A as it
supposed to be.)  I carefully bench tested the amplifier with the bad
7027A removed, and all stages are working normally. 

Its rated output is 75 Watts, with taps for 4, 8, 16, 65 Ohm, & 25V, 70V
on terminal strip, plus two 5-pin speaker sockets.

Tube complement:
 3 sockets labeled GZ34  with 5AR4 (Bogen)
 2 sockets labeled 7027A with 1 BAD 7027A (Bogen) and 1 7027 (unbranded)
 2 sockets labeled 12AX7/ECC83 with  12AX7/ECC83 (Telefunken)
 1 6AV6 (Bogen)
 1 7247 (Bogen)

Pictures at
 http://home.att.net/~a.schapira/pix/bogen/PICT0001.JPG
 http://home.att.net/~a.schapira/pix/bogen/PICT0002.JPG
 http://home.att.net/~a.schapira/pix/bogen/PICT0003.JPG
 http://home.att.net/~a.schapira/pix/bogen/PICT0004.JPG
 http://home.att.net/~a.schapira/pix/bogen/PICT0005.JPG
 http://home.att.net/~a.schapira/pix/bogen/PICT0006.JPG


	-Al Schapira, KC2HRH, a.d.schapira@worldnet.att.net

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