[Boatanchors] [Heathkit] Additional, SB-1000, no 10 meteroutput

[Dave]

Larry,

Thanks for the suggestion. All coil taps and capacitance value are per 
the construction manual and schematic. Input filters are passing a 
28.700 MHz 20 watt CW signal at near input levels as observed with a 100 
MHz scope.

As another person who replied noted it would be impossible, since there 
was no screen voltage at the socket, to have any (other than some 
leakage) from the tube I found in the 3-500 socket.

The only irregularity I have found, thus far, is the plate choke.

There is a slight dip in plate current at what should be resonance; 
increasing the drive to 50 watts does not increase the output. In fact, 
I end up with less power than I put in and the plate of the 3-500 starts 
going "cherry red".

No shorted or damaged caps. As mentioned, all other bands are fine.

Dave, W5WP



On 7/4/2016 2:43 PM, Larry wrote:
> Just a wild guess.  Could it be a CB modded amp and has full output on 
> 11 meters?
>
>
> Larry
>
> WB2UFO
>
>
> On 7/4/2016 2:23 PM, Dave wrote:
>> Apologies;
>>
>> The tube I found in the amplifier was / is a*4-125A*. Never trust an 
>> 80 year old short term memory <g>
>>
>> Additional info: With the power off and caps discharged I keyed my 
>> bench test transceiver set at app. 20 watts output and with a scope 
>> at the filament choke at the 3-5400 socket end I manually keyed the 
>> antenna transfer relay.  Almost the full 20 watts (peak to peak 
>> voltage at 28.700 MHz appeared at the tube.
>>
>>
>> Dave, W5WP
>>
>>
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