Re: [Amps] 3-500z - intermittent filament

["David G4FTC" <g4ftc@hotmail.com>]

> From: "Robert B. Bonner" wrote
>
>
> Well the amplifiers where where air blew sideways across the tubes and pins
> instead of through the sockets or didn?t have enough airflow due to NOISE
> CONCERNS developed a syndrome.


That reminds me of a conversation I had with someone on the Alpha stand at 
Dayton a few years ago.

I commented upon what I thought was a rather hot exhaust temperature on one 
of their amps and asked whether it would have been better to increase the 
airflow.

The answer was quite simple - blower/fan noise is the biggest turn-off to 
potential buyers. More air flow means more noise, and in order to sell an 
amplifier in an amateur market, blower/fan noise must be kept to the 
absolute minimum.

However, the use of the ceramic bases and the fan as opposed to a proper 
blower and Eimac air system sockets for the SB-220 and the L4B is more 
likely to be for commercial reasons - i.e. getting a product to market for 
no more than a certain price.

David G4FTC

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