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Post by redrobbie on Sept 2, 2008 20:41:14 GMT
I put in a new tube for the left channel, then within the hour it starts to crackle. Is it overheating? I've replaced the transformer with a bigger one. The right channel is not effected.
Can anyone help?
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Post by PinkFloyd on Sept 2, 2008 22:33:44 GMT
swap the tube to the right channel.... if the problem then appears in the right channel it is a defective tube...... replace it. Simple as that  |
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Post by redrobbie on Sept 3, 2008 13:35:14 GMT
I'm not putting another working valve in the left channel - I've been through three already...
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Post by gns on Sept 3, 2008 19:48:52 GMT
Residue on the pins? Tried cleaning?
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Deleted
Deleted Member
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Post by Deleted on Sept 3, 2008 21:48:52 GMT
Years ago, scraping valve pins clean used to be almost a ritual, as was replacing some of the poorer quality sockets often used with 7 pin and 9 pin valves.
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Post by PinkFloyd on Sept 3, 2008 22:43:25 GMT
I'm not putting another working valve in the left channel - I've been through three already... If you had mentioned you had tried "three" in the first place then I would not have suggested what I had suggested. Hold on tho...... maybe I would have suggested the same..... just because you've tried three tubes in the left channel and all three have produced the same effect does not mean something else is to blame.... maybe all the tubes you have tried are knackered? Before we go any further I insist that you swap one of the tubes into the right channel and see if the problem migrates to the right channel.... swap the right channel tube into the left channel etc. Did this problem only come about when you replaced a tube in the left channel or did you replace the left channel tube because of this crackling in the left channel? To diagnose a fault via "text" is nigh on impossible and usually the best answer is "check the obvious"....... please do NOT assume that all three tubes you have inserted into the left channel are all perfect and please do as I advise and fit the known "good" tube into the left channel and see if the fault migrates to the left.... if so, there's your answer. Other things it may be? You may have been heavy handed rolling the tube into the L/H socket and disturbed a connection (ie: pressed down so hard one of the pads may have parted company with the PCB) have you checked the integrity of the solder joints with respect to the valve base? The valve bases that MF fit are micky mouse at best and frequent (or heavy handed) valve rolling can cause the sockets to "loosen" causing an intermittent / poor connection...... get yourself a pin and gently go round each valve base connection and "lever" the connectors inward so they provide a tight connection between the valve pins and sockets. polishing / scraping the valve pins will be of no use if the actual female connectors are sloppy.... it's like shagging a bucket with a pencil.... no connection, no stimulation and no orgasm. Other possibilities? How long is a piece of string? It could be one of your input caps that's knackered allowing DC into the L/H channel....... your quad phono socket could have a dodgy ground connection on the L/H channel..... some of or one of your PSU caps could have seen better days.... you interconnects may be dodgy (again, try swapping them around)..... your actual headphone socket could be dirty / intermittent contact and need replacing...... it could be a multitude of things but PLEASE start with the most obvious and PLEASE give us a bit of background as to where and when this started. To diagnose and to remedy we need the symptoms and we need as much detail as possible if we are to be able to offer a cure via "text"...... give us the whole story, the "when I did this it happened" or ""when I removed this it happened"...... only that way can we not only understand the situation but also try and figure out the remedy. All the best. Mike. |
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FauDrei
Been here a while! 
Posts: 489
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Post by FauDrei on Sept 4, 2008 19:29:08 GMT
Have had the same problem with V2. In fact because of this crackling in one channel I joined the RockGrotto in the first place... In my case the problem was in dirty valve socket (and/or valve pins). Therefore I'll join Graham and Mike and recommend a socket/pins cleaning and valve swapping. ...just to think that I've realized the source of my problems after several valve changes and substantial V2 modding...  ...not that I'm complaining - learned a lot and discovered a new hobby and plenty of friendly nutters like me  |
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Post by sometrolls2 on Sept 5, 2008 8:31:59 GMT
Definitely have a look at the headphone socket joints
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...not that I'm complaining - learned a lot and discovered a new hobby and plenty of friendly nutters like me 