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  1. Replies
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    915

    Hi. Yes I did. 54v +/— it's OK I have sorted it...

    Hi. Yes I did. 54v +/— it's OK I have sorted it now.
    Resoldered the area again. And cleaned it.
    Worked for 4 days 6 hours a day. Been collected to sit about in storage �� till this shit is over
    ...
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    6
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    915

    Hello again Is there anyone that can help or...

    Hello again
    Is there anyone that can help or shed some light on this.
    Too me it makes no senses.
    But believe me with a scope probes on input and output both on same setting per div etc.
    ...
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    3
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    210

    Thank you. You were right I had a hunch on the...

    Thank you. You were right I had a hunch on the caps. But I dismissed it. Was c44. Replaced it back working correctly
    Thanks again.
    arbutt
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    3
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    210

    Vox pathfinder 15r reverb issue

    Hi everyone.
    I have a pathfinder 15r with no reverb
    I understand its a practice amp. But the owner
    Really loves it. So please no bin it comments
    On inspection I can see the tank is ok
    128ohm...
  5. Replies
    6
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    915

    Thank g1. OK as follows using dmm on ac range....

    Thank g1.
    OK as follows using dmm on ac range. Between chassis and transistors
    Iq1 base 3v collector 0v emitter 3v
    Iq6 base 0v collector 3v
    Iq10 base 3 .5v collector 0v emitter 3v

    I hope...
  6. Replies
    6
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    915

    Please bare with me struggling to get the map up...

    Please bare with me struggling to get the map up loaded. I only use a phone. It says I can't upload a pdf format
    57026
    Sorry it's the best I can do at present
    57027
  7. Replies
    6
    Views
    915

    L2 wmp12h 300watt floor Monitor

    Good afternoon to you
    Now I might be being a dick here. But this amp is causing me pain

    It came in to me with a intermittent noise issue.
    I found the fault ir9 was soldered in but leg cut short...
  8. Replies
    0
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    565

    Eh electric mistress v2 1976

    Hi all
    I was asked by a friend to look at this.
    Was sold tested working on ebay. Returned faulty
    Bypass OK no effects
    55880
    I found bc309 gone replaced it
    Now I have signal passing...
  9. Replies
    15
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    847

    Even in play mode the amp has no output I guess...

    Even in play mode the amp has no output I guess reading the post looks like a channel change issue sorry I can't help good luck with it
  10. Replies
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    599

    Led light system faulty smpsu

    Hello.
    I have an issue with a 32v psu for a led light system.
    Basically 2 screws came loose and touched the board. Failed mid show. No blown fuse or any burnt component.
    So I changed the uc3842...
  11. Replies
    0
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    535

    Led light system faulty smpsu

    Hello.
    I have an issue with a 32v psu for a led light system.
    Basically 2 screws came loose and touched the board. Failed mid show. No blown fuse or any burnt component.
    So I changed the uc3842...
  12. Replies
    7
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    1,767

    The unit in stand by.. Only running off a stand...

    The unit in stand by.. Only running off a stand by 10v dc transformer. The mains voltage is switched by relay. At present relay not switching on. 10v dc is present. By not coming on.

    Many thanks...
  13. Replies
    7
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    1,767

    53445

    53445
  14. Replies
    7
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    1,767

    Marantz pm6005 now stby only

    I did post another earlier. My phone crashed

    Hoping you can help.
    I was ask to have a look at this.
    It was intermittent on one channel. Played around with the headphones jack and it came...
  15. Replies
    10
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    1,359

    I understand what you are saying. Well a bit...

    I understand what you are saying. Well a bit anyway ;>). I'll do my best to get it right without the power amp.
  16. Replies
    10
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    1,359

    Many thanks helnholtz. I'll do that later

    Many thanks helnholtz. I'll do that later
  17. Replies
    10
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    1,359

    I was going to do that anyway. As an option not...

    I was going to do that anyway. As an option not sure on what values of resistors to use as yet
  18. Replies
    10
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    1,359

    OK the owner built his own power amp and decided...

    OK the owner built his own power amp and decided that it sounds better without nfb. He said he tried various resistor and cap arrangements. But settled for no negative feedback. He fitted a steroe...
  19. Replies
    10
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    1,359

    Audio Stereo valve pre amp NFB

    I'm just about to complete a build for someone. And he wants a 2 - 3 way NFB switch on the front of his pre amp. The switch has been fitted.
    Now he owns a power amp that he built without NFB and he...
  20. Replies
    11
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    709

    Many thanks for all your help. It's now sorted....

    Many thanks for all your help. It's now sorted. Mostly ground issues . And few lead address. I've learnt a few things about ground placement in the last few days. arbutt
  21. Replies
    11
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    709

    Hi pdf. I'm not sure on the g1 question.. As I'm...

    Hi pdf. I'm not sure on the g1 question.. As I'm more self taught... I have removed the centre tap from the heaters and connected it to the same as the 0v from dog house to the power tx. The pots do...
  22. Replies
    11
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    709

    Hello people. Been busy today but I have made...

    Hello people. Been busy today but I have made some progress. Loudthud was on the money. I have removed the 2 red wires and add one and grounded on the power tx. It so much better channel 1 is great...
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    11
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    709

    Thanks for that. The cap on the bias pot I added...

    Thanks for that. The cap on the bias pot I added an extra 10 uf as I could see a little ripple. The main cap is 100uf 100v. Fitting the 10uf made no difference. I will look at it tomorrow and do the...
  24. Replies
    11
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    709

    super reverb amp clone issues

    Hello

    I have a noise issue on a clone
    It came in to me with a note saying just dont sound right, the owner did not make it
    I replaced 3 pre amp tubes and power tubes
    Bias cap and pot, input...
  25. Replies
    41
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    2,371

    Many thanks to you all for the help. I have done...

    Many thanks to you all for the help.
    I have done what chuck said and it's working perfectly.
    Only think I haven't done is the 91k as I didn't have any.
    I have ordered some and will change.. I'm...
  26. Replies
    41
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    2,371

    Thank you Chuck. I had to look twice at this....

    Thank you Chuck. I had to look twice at this. Thinking it's my circuit . Thought you were taking the piss as the British will say :)
    I will do this and report back

    So I will leave you guys alone...
  27. Replies
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    2,371

    Both channels were wired the same and both...

    Both channels were wired the same and both channels were slightly distorted at a higher level . The bias was fixed and at 25ma per tube. Tubes are now stock Russian brand unknown. Tested ok on a...
  28. Replies
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    2,371

    Morning . Had a read last night on AC and DC long...

    Morning . Had a read last night on AC and DC long tailed pair pi. On valve wizard web site As jazz p bass said. I sort of understood it .
    I've decided to go for AC long tailed pair.
    I'm going to...
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