Version 4
SHEET 1 880 680
WIRE -384 -96 -512 -96
WIRE -256 -96 -304 -96
WIRE -32 -96 -256 -96
WIRE 48 -96 -32 -96
WIRE 400 -96 272 -96
WIRE -512 -48 -512 -96
WIRE -256 -48 -256 -96
WIRE 400 -48 400 -96
WIRE 48 48 -160 48
WIRE 320 48 272 48
WIRE -256 64 -256 16
WIRE -512 80 -512 32
WIRE 400 80 400 32
WIRE -32 96 -32 -96
WIRE 320 128 320 48
WIRE -160 176 -160 48
WIRE -32 224 -32 176
WIRE -32 224 -112 224
WIRE -208 240 -512 240
WIRE -512 288 -512 240
WIRE -32 304 -32 224
WIRE -192 352 -192 288
WIRE -512 416 -512 368
WIRE -432 416 -512 416
WIRE -32 432 -32 368
WIRE -432 448 -432 416
WIRE -512 464 -512 416
WIRE -512 576 -512 528
WIRE -432 576 -432 528
FLAG -432 576 0
FLAG 320 128 0
FLAG 400 80 0
FLAG -32 432 0
FLAG -512 576 0
FLAG -512 80 0
FLAG -256 64 0
FLAG -192 352 0
SYMBOL voltage -512 272 M0
WINDOW 123 24 132 Left 0
WINDOW 39 27 158 Left 0
SYMATTR Value2 AC .1
SYMATTR SpiceLine Rser=600
SYMATTR InstName V1
SYMATTR Value SFFM(0 0.1 10.7meg 50 5k)
SYMBOL res -288 -112 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 384 -64 R0
SYMATTR InstName R2
SYMATTR Value 1meg
SYMBOL cap -48 304 R0
SYMATTR InstName C1
SYMATTR Value 2.2n
SYMBOL res -448 432 R0
SYMATTR InstName R3
SYMATTR Value 47k
SYMBOL cap -496 464 M0
SYMATTR InstName C2
SYMATTR Value 1n
SYMBOL voltage -512 -64 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 120
SYMBOL cap -272 -48 R0
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL FM_IF_transformer 160 -32 R0
SYMATTR InstName U2
SYMATTR SpiceLine Cp=10p Cs=10p Lp=14.6u Ls=22u Rs=100k
SYMBOL res -48 80 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL Valve\\Tetrode -160 224 R0
SYMATTR InstName U3
SYMATTR SpiceModel EF80
TEXT -520 -240 Left 0 ;.ac lin 100 5meg 15meg
TEXT -520 -336 Left 0 ;Demonstration of FM IF transformer, EF89 variable-mu pentode.
TEXT -520 -200 Left 0 !.tran 1ms
TEXT -520 -280 Left 0 ;enable either of the following:
TEXT 64 208 Left 0 ;^ note L1 is tuned smaller to compensate\nfor anode extra capacitance (5.1pF)