[RTTY] Heathkit SB-1000 On RTTY

[Joe Subich, W4TV]

The Eimac data sheet on the 3-500Z gives 400 mA as the "maximum rating"
in class AB2 service.  The bigger question is not current it's heating.

The SB-1000 uses a fan rather than the Eimac specified pressurized
cooling - plate dissipation is reduced to about 300 W at 50% of the
specified airflow.  You will need to be careful about overheating the
glass to metal seals around the pins under long/high duty cycle use.
You probably want to look at auxiliary cooling and keep the SB-1000
below 400 W out if you are going to do any significant RTTY operation.

73,

    ... Joe, W4TV


On 9/24/2012 11:07 AM, Thomas F Giella NZ4O wrote:
> I have a Heathkit SB-1000 amplifier with the single 3-500Z. The manual
> for the Heathkit SB-1000 says a maximum plate current of 400 mA for CW
> and 550 mA on SSB.
>
> What would be a safe maximum plate current for RTTY operation, which is
> obviously 100% duty cycle like AM operation?
>
> 73 & GUD DX,
> Thomas F. Giella NZ4O
> Lakeland, FL, USA
> nz4o at tampabay.rr.com
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