[BC] Ambassador, Exceutive, President, Executive consoles

[Milton R Holladay Jr.]

When the SoundTech 1710 came out, some of the transformers from this series
of consoles were measured and found to have significant distortion, so it
wasn't entirely the circuits that made them have a very gritty sound.
The RCAs of the time (Bc-7s, etc.) sounded dull , though clean, by
comparison because they had low distortion.............
M
----- Original Message ----- 
From: <dhultsman5 at aol.com>
To: <broadcast at radiolists.net>
Sent: Friday, April 06, 2007 11:04 PM
Subject: Re: [BC] Ambassador, Exceutive, President, Executive consoles


> Those monitor amps were junk.  After repairing them in an AMbassador,
President, Diplomat and Executive I replaced them with DYNAKIT Stereo 120's.
As I recall we muted the inputs.  I don't recall that many problems after
getting rid of those amplifiers.
>
> When WRR purchased their Diplomat for AM,  the first thing I heard was the
distortion on the Control room mikes.  After carefully checking it out,  the
clipping ocurred on the 2N1414 first stage transistor in the mic pre-amp.
To solve the problem I bypassed the solid state pre-amp with a Gates type
5530 amplifier using 6267's and a 12AU7 and the jock were happy.  Additional
checking found that the same stage in the front end of the 5700 program amps
would clip on audio peaks.  As I recall I changed the bias on that stage.
We added another stage on the microphone pre-amp to decrease the gain in
each stage.  Then when we bought an Executive for the FM, my plan was to use
a tube type mike pre-amp in our FM but Harris had changed to the 2n1307's
which were much better and the clipping was not a problem.  u
> Dave Hultsman
> Birmingham, AL
> Tel Toll Free (888) 822-1078
> Fax (205) 822-6441