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Old 7th Jul 2019, 11:03 pm   #8
dekor8tor
Triode
 
Join Date: May 2016
Location: Cannock, Staffordshire, UK.
Posts: 41
Default Re: Hacker GP42 and AL42 restoration help

hi all i have measured dc voltage as mentioned in the service manual as follows

H.T.1 C12 280vdc
H.T.2 C11 264vdc
H.T.3 C8 237vdc
V1a pin 9 anode 150vdc
V2a pin 9 anode 167vdc
V1b pin 6 anode 258vdc
V2b pin 6 anode 260vdc
V1a pin 2 cathode 0.8vdc
V2a pin 2 cathode 1.3vdc
V1b pin cathode 7.3vdc
V2b pin 7 cathode 7.4vdc

R15 52.3v
R10 6.2v
R14 4.95v
R13 7.4v these are resistor voltages across the resistors dc
R8 1.3v
R16. 0v
R5. 0v
R4. 0.85v
R21. 10.7v
R18. 0.01v
R19. 0.01v

C3. 0.87v
C5. 1.3v
C9. 7.3v
C10. 7.5v
C8. 236v these are capacitor voltages across the capacitor dc
C16. 253v
C7. 137v
C6. 136v
C14. 0v


i hope these make sense to someone because if any components have failed i would like to change them before i use the equipment
many thanks for you help

https://www.vintage-radio.net/forum/...d.php?t=111739

Last edited by dekor8tor; 7th Jul 2019 at 11:09 pm.
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