[Heathkit] Another hethkit Mohican question

[Philip Atchley]

Hi,

Today I was doing a little more work on my "Nostalgia" radio, a Heathkit 
Mohican.  This set has been overhauled, repainted, aligned etc and is playing. 
However, I noticed on the higher bands that strong stations "pull" the 
frequency as they fade up and down, probably because the AGC action is causing 
different Voltage drops in the circuit.

Studying the schematic, it shows that there is a 6 Volt Zener diode regulator 
in the supply line to the RF amplifier, Mixer base and LO transistors. For 
some reason this set DOESN"T have that Zener and that supply rail is riding at 
9-10 Volts, and I suspect will change with AGC action.  Eureka!  It looks like 
I found my problem.

But first a simple question.  I'm wondering if the person who built the set 
overlooked installing the diode and couldn't figure out where the "extra part" 
belonged, OR if Heathkit came out with a change to the circuit, leaving it out 
for some obscure reason?

Anybody know?

73 de Phil,  KO6BB
http://www.geocities.com/ko6bb/
Merced, Central California, 37.3N  120.48W  CM97sh