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  #1  
Old 25th June 2018, 05:04 PM
colin.hepburn colin.hepburn is offline
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Default WAD CF Pre relayboard not working Help

Hi All
Well decided to dig out my old WAD CF Pre amp I got from bob abit back havenít used it in a while.

Last time I was using it I added single Lin pot across the input to act as a balance control .this worked well, but I never mounted the pot into the case would have had the drill front panel and not sure I wanted to do that at the time
So last night I removed this pot and decided to have a listen the CF pre again. and then found that there is no input single on any of the input a cross the relay board
So I rechecked the wiring on the new 50k Alps pot I install on a pcb and all is good there
I then plugged the CD player in to the tape in loop phono socket by mistake and now have sound with gain from the Alps pot so the pre is working inputting and outputting the single at least

I did note that the front panel LED was not lit so checked all heater voltages all good there so led is dead also checked input voltages at relay board and got the expected 6.2 volts at all the relays and metering ground to heater B+ 42 volt same as the phono 2
So looks like the relays are not switching
Any ideas on this
John. Richard. Bob. And others
Thanks
Colin
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Old 25th June 2018, 06:41 PM
John Caswell John Caswell is offline
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Default Re: WAD CF Pre relayboard not working Help

Hi Colin,
1) Did it work originally?
2) Is the 6.3 v supply the correct way round, because the LED is not lit up, which could mean that the heaters supply is the wrong way round.

John
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Old 25th June 2018, 06:50 PM
bob orbell bob orbell is offline
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Default Re: WAD CF Pre relayboard not working Help

Agree with John Colin, you have your heater wires crossed , come on Colin, get a grip, . BOB
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Old 25th June 2018, 07:04 PM
colin.hepburn colin.hepburn is offline
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Default Re: WAD CF Pre relayboard not working Help

Quote:
Originally Posted by John Caswell View Post
Hi Colin,
1) Did it work originally?
2) Is the 6.3 v supply the correct way round, because the LED is not lit up, which could mean that the heaters supply is the wrong way round.

John
AH right I did not think of that as the valve lit up I just thought the led had expired
I didnít touch the heter wiring in the CF pre but did rebuild the PSU and phono stage in to new home made cases

so maybe i inverted the wire in the psu I will check it out and report back later
Thanks for the pointer john/ bob
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Old 25th June 2018, 07:06 PM
colin.hepburn colin.hepburn is offline
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Default Re: WAD CF Pre relayboard not working Help

Quote:
Originally Posted by bob orbell View Post
Agree with John Colin, you have your heater wires crossed , come on Colin, get a grip, . BOB
if this is correct and i have crossed me wires i will give me a slap
Colin
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Old 25th June 2018, 09:07 PM
bob orbell bob orbell is offline
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Default Re: WAD CF Pre relayboard not working Help

Don't be too hard on yourself Colin, he who made no mistakes made nothing, and we have all done something wrong. BOB
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Old 25th June 2018, 09:44 PM
colin.hepburn colin.hepburn is offline
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Default Re: WAD CF Pre relayboard not working Help

Boy you guys are good it’s fixed
It’s that umbilical cord three Black and one green/yellow
Thanks again john/bob and all that jazz again is flowing again
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Last edited by colin.hepburn; 25th June 2018 at 09:49 PM. Reason: Me Spelling again
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Old 26th June 2018, 09:36 AM
John Caswell John Caswell is offline
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Default Re: WAD CF Pre relayboard not working Help

Hi Colin et al,
Although I am not normally into violence I have to admit a good slap often helps gel the brain
Nicely done Colin

John
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