Robert W. Stankus wrote:
>
> Dennis:
> Now that you have updated this very nice amplifier and now have higher
> d.c voltage, you might want to do this:
> For 3500 Volts as your plate supply, these are the specs.
>
> DC = 3500
> Ip = 250 ma Zero signal
> Ip = 800 ma Max Signal
> Ig = 200 ma Max Signal
> Drive Power - 45 watts
> Cathode Impedance = 67 ohms
>
> One thing to remember about this unit is it contains a voltage doubler
> supply. You may want to consider a new Dahl transformer and make it a
> full wave bridge.
>
> The other thing...this amplifier (RF-2000) was operated as a zero bias
> triode with no bias circuit...only a 50K/10w resistor in the cathode
> that is switched out on xmt.
> You might try this trick...Use 1000 PIV/2.5 amp diodes.. They make
> excellent zeners. They are rated at .6 volt. Use as many as necessary
> to establish your no signal resting current. Place these diodes in
> series (remember .6 volt per diode) with the 50K/10 w resistor lead
> that goes to the by-pass cap and junction with the plate meter.
>
> Also, they did make a BTI model known as the LK-2000 HD which had a
> beefed up power supply.
> Can you believe this amp (BTI-LK-2000) sold for $795.00 w/tube in 1970.
> It was made by Hafstrom Technical Products, Inc. in San Diego.
>
> Regards,
> Bob - K4NV
> RobertW@ewol.com
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