[Heathkit] SB-620 interface

[R. Blackman]

Hello to all on list.
I have built an interface to use my SB-620 with my Icom 706 MKIIG
The basic building blocks include a crystal controlled 5.76 MHz oscillator, 
(chosen since I had the crystal,  and the math works out)  This feeds a 
double balanced diode mixer, the other input of which is the 9.01 MHz IF of 
the Icom. The resulting 3.25 Mhz and other products are sent through a 
bandpass filter set to 3.25 MHz, and then on to the SB-620.
The SB-620  L2 is adjusted to get the 3.25 MHz pip centred.
Works fantastic with a signal generator set to the IF of 9.01 Mhz, My big 
question to all you Heathkit / Icom 706 owners, where should I tap off the 
IF in the Icom??
I think it should be near the output of FI561, maybe at R513 or R512?
If anyone on list has the schematic for the 706 I would love to hear your 
ideas.
When I get the circuit actually working with my radio, I will post it on my 
website for all you SB-620 owners to consider. This may be the way to keep 
the SB-620's up and running without the never ending search for obsolete 
coils.
Richard /VA3NDO