Heathkit FM-4 FM Tuner

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1/2 6BN8& 
RATIO DETECTOR 


6AU6 
LIMITER 


6AU6 
r2 2ND |. F AMP 
I 
| Lew 
| @) 
a l — 
| {L@ © 
t c24) 
) | @ .0d5 FD 
) | => 
} 
| 
] 
sae el 
7 a3 ¢23|270 = 
820 
K i 
al 
a= 
AFC 
R2B 
2209 
Iw 
0 40 
‘D C40jMFD 
OV 150V 


1.7MH 
c4 
@ 


OOS|UFD 


V2 6BN8& 
CATHODE FOLLOWER 


VOLUME 


HEATHKIT F M TUNER 
MODEL FM-4 


ce} fea2 


| TWISTED @ 


WIRE 6AU6 
\ 1ST LE AMP 


TI 


2 6DTB salen V2 6DT8 ; fl 
RF AMP am osc MIXER |(000) 
| ~ aE hg | | 
XX = = | 
5 fc2t 
| @ — ' ce (3 - O | 1 
? i} 
| © pahettl 6 nm | | 
C4/3.6 | | 
J ! 
—e C1 => 
| na Locts. L 
001|UFD 
L3 Somme 
9.5 UH ci2\15 i 
c5/|8.2 C751 


x1 R6 
ee C8136 220K 
c15 {8.2 


NOTE: ALL DC VOLTAGES TAKEN TO CHASSIS WITH A 
HEATHKIT VACUUM TUBE VOLTMETER. 


ALL VOLTAGES MAY VARY 110% FROM INDICATED 
VOLTAGES. 


VOLUME AND TUNING CONTROLS FULL CLOCKWISE. 
ANTENNA TERMINALS SHORTED. 
AFC SWITCH IN OFF POSITION. 


ALL CAPACITORS MARKED IN uuf UNLESS OTHERWISE 
INDICATED. 


ALL RESISTORS ARE 1/2 WATT UNLESS SPECIFIED 
OTHERWISE. 


C10, C11, C13, C16 AND C17 ARE FEED 
THROUGH CAPACITORS, 


ARROWS 4 AT TRANSFORMERS Ti, T2, T3, AND T4 
INDICATE TOP SLUGS, 


R3 


4.7MEG 


C12} {1000 


R5 


1oK 


ON-OFF SW. 


417 VAC 
50-60%