[Boatanchors] HP-8708A Synchronizer?

[Richard Knoppow]

----- Original Message ----- 
From: "David C. Hallam" <dhallam at knology.net>
To: <boatanchors at mailman.qth.net>
Sent: Monday, March 31, 2014 8:15 AM
Subject: Re: [Boatanchors] HP-8708A Synchronizer?


> Ian,
>
> I have a 606B and a synchronizer.  Now that my 606B is 
> working properly, I will get an idea of how well it works. 
> I had to replace filter capacitors in the power supply. 
> That was a PITA job as the capacitors are somewhat 
> unusual.  The can is insulated and the negative is not 
> connected to the can. The ripple was way out of spec and 
> the 606B frequency wouldn't stabilize.
>
> I do have a manual for it.
>
> David
> KW4DH
>
    I've seen isolated filter caps in other equipment such 
as some Boonton Radio instruments. They are standard can 
caps but mounted on phenolic wafers and have an insulating 
sleeve of plastic or cardboard over them. In some 
intstruments the chassis is not at the supply zero voltage. 
Its been too long since I've been into a 606A or B but -hp- 
liked to use regulated supplies where one was used as a 
reference for the other so that the voltage between them was 
very constant.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com