[BC] Gates Transmitter Parts Needed!!

[dynotherm at earthlink.net]

-----Original Message-----
>From: Alan Alsobrook <radiotech at bellsouth.net>
>Subject: Re: [BC] Gates Transmitter Parts Needed!!
>
>If the fuses didn't blow as soon as you turned it on, I doubt it's a rectifier problem, first 
>suspicion is where I previously mentioned.. the 807 think plate short, due to sagging grids. 
>I'm sure that's never happened before in a BC 1G.. A fan blowing on the 807's may buy a small
>amount of time.


If you must run a BC-1G as a full time main you might strongly consider changing 
the driver board orientations from vertical to horizontal.

Two pair of angle brackets, two eight inch diameter condenser fans, and the
807's will have a chance IF you can find some NOS JAN 807's.

Remember that the RF driver is the weak point of the BC-1T/G design. It needs 
every advantage it can get.

Note that the cooling fans must pass air horizontally across both the RF and 
modulator driver boards, and that the preferred flow line is along the midline 
of the boards, or perpendicular to a line between the 807 plate caps. Thus, you
will probably need to extend the angle brackets toward the center of the cabinet
so the fans can blow toward the side panel. Plenty of air flow room is essential
so the lower board does not increase the temperature of the upper most board.
It is also important to assure that the load is shared equally by either side
of the driver circuits. This is fairly obvious in the modulator, but needs more
attention in the RF driver.

Phil Alexander, CSRE, AMD