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Kenwood TS-520 SSB HF Transceiver No Transmit Repair

Specs:
GENERAL
Type: Amateur HF transceiver
Frequency range: 10-80 m i 7 bands
3.5-4.0 MHz
7.0-7.3 MHz
14.0-14.35 MHz
21.0-21.45 MHz
28.0-28.5 MHz
28.5-29.1 MHz
29.1-29.7 MHz
+ 10.0 MHz WWV receive only
Tuning steps: Analog / continuous
Frequency stability: Within ±2 KHz during the first hour after 1 minute warmup.
Within 100 Hz during any 30 minute period thereafter.
Mode: SSB / CW
Channels / memory management: 4 optional
XTAL controlled
Repeater shift / offset: No
Power supply: Mains: 120 / 220 VAC
or 13.8 VDC
(12-pin Jones connector)
Current drain / power consumption: RX: 45 W @ mains - 5 A @ 13.8 VDC (Heaters on)
TX: Max 280 W @ mains - 15 A @ 13.8 VDC
Antenna impedance / connector: 50-75 ohm / SO-239
Dimensions (W*H*D): 335*150*335 mm (13.2*5.9*13.2")
Weight: 17 Kg (37.4 lb)
Other features: NB. VOX. 25 KHz XTAL calibrator.

RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 8.295-8.895 MHz
2nd IF: 3.395 MHz
Sensitivity: 0.25 uV (10 dB S+N/N)
Selectivity: SSB
2.4 KHz (-6 dB)
4.4 KHz (-60 dB)
CW (With optional CW filter)
500 Hz (-6 dB)
1.5 KHz (-60 dB)
Image rejection: 50 dB
AF output power / speaker: 1 W at 10% distortion / 8 ohm
External speaker connector:

TRANSMITTER SECTION
RF output power:
SSB (PEP): 100 W
CW (DC): 100 W

NB! Output is lower with 13.8 VDC than with mains supply
Modulation system:
Max FM deviation (Factory set): No FM
Spurious emissions: Better than -40 dB
Microphone impedance / connector: 50 Kohm / 4-pin (Metal locking ring connector)
Microphone input level: ? mV

MISCELLANEOUS
Manufactured: Japan, 1973-197x (Discontinued)
Additional info: Tube hybrid: 12BY7A driver and two S2001A finals
Related documents: User manual (4.6 MB)
RF driver: 12BY7A
Modifications and fixes:
Reviews:
Options / Accessories:
MC-10
MC-50
SP-520
TV-502
TV-506
VFO-520 Hand microphone. 50 Kohm
Desk microphone. 500 ohm/50 Kohm selectable
External speaker. 8 ohm, 2 W
2 m transverter
6 m transverter
External VFO

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