[Heathkit] Heathkit SB-610 Monitor Scope Receive

[Glen Zook]

You apply the signal through a low value capacitor, not connected directly to the plate.  That protects the input from the B+.  The only thing is that you may have to realign the receiver to compensate for the additional load of the "scope".

Glen, K9STH

Website:  http://k9sth.com


--- On Fri, 12/11/09, Tom Buchanan <tlbuch at scrtc.com> wrote:

I recently got a Heathkit SB-610 Monitor Scope that needed repair. I replaced all the capacitors and several resistors that had changed in value. Now the scope is working great on ssb & cw transmit with my Heathkit SB-102/SB-200.

I read an article online from a January 1968 Radio Communication for the SB-610 that said for receiver monitoring it is preferable to connect a lead to the anode or plate of the last IF amplifier to take advantage of the gain to obtain maximum display of small signals.  According to the SB-102 manual the 2nd IF amplifier is V4 (6AU6) and pin 5 is the plate.
 
I don't want to toast the scope just as I have got it working again.  Any thoughts on how well this will work or does the SB-610 work okay monitoring the receiver?