[Boatanchors] HP 606 vs. 608

[James A. (Andy) Moorer]

Indeed, using a generator with dinky little output transistors to feed an 
unknown piece of equipment is asking for trouble. Feeding something with a 
606 or 608 which have vacuum-tube followers on 150-volt power supplies will 
take just about anything you can give it - and may fry whatever you try to 
connect it to.

Indeed, the 606 makes a great VFO, although the output may be a bit hot for 
your use, and, as noted before, you will want to use it with the 8708 
synchronizer to keep it from drifting off the edge of the band. A .01 in the 
line never hurt anything. Similarly, you may want to put a frequency counter 
on it to see exactly where you are. The 608 has two outputs - one isolated 
output before the attenuator that can go right into a frequency counter, and 
the other after the attenuator that can go to the crystal input.

James A. (Andy) Moorer
www.jamminpower.com

----- Original Message ----- 

> Be very careful. I was once working on a transmitter and needed VFO input.
> Hooked up my  Hi Tech HP Signal Generator and found I was pumping voltage
> from the transmitters Osc stage back into the Signal Generator. Blew out a
> proprietary output chip on the generator and hence destroyed it. Not 
> happy!!
> Lesson for me is that I ALWAYS put a .01 mfd cap in the line of my 
> generator
> now.
>
> Mark V Johnson VE3DJU/VE3DDI
> ----- Original Message ----- 
> From: "Barrie Smith" <barrie at centric.net>
> To: <boatanchors at qth.net>
> Sent: Wednesday, February 11, 2009 6:44 PM
> Subject: Re: [Boatanchors] HP 606 vs. 608
>
>
>>I have a 606A.
>>
>> I've been thinking of using a small rice-box as a VFO for my 
>> HT-4B/BC-610.
>>
>> I wonder if the 606A would work well as a VFO for the transmitter?
>>
>> I would be feeding the output of the 606A into the crystal socket on the
>> tuning unit.
>>
>> Any thoughts?
>>
>> 73, Barrie, W7ALW
>>