Members Prehistoricpain Posted August 31, 2010 Members Share Posted August 31, 2010 The amp is a peavey vtm. It worked totally fine last practice, then yesterday I plugged everything in and the tubes aren't even lighting up. what gives?! Link to comment Share on other sites More sharing options...
Members RoboPimp Posted August 31, 2010 Members Share Posted August 31, 2010 did you fill it with apple sauce? Link to comment Share on other sites More sharing options...
Guest Guest Posted August 31, 2010 Share Posted August 31, 2010 Blown fuse? Link to comment Share on other sites More sharing options...
Members Prehistoricpain Posted August 31, 2010 Author Members Share Posted August 31, 2010 Blown fuse? Checked the fuse, looks fine. Tried all the speaker outs, different cords, different cabs. Nothin'. I had this same amp working, great last week and then this practice it just wont light a single tube, not even the preamp tubes. Link to comment Share on other sites More sharing options...
Members RUExp? Posted August 31, 2010 Members Share Posted August 31, 2010 Change power tubes, replace fuse. Check again. Link to comment Share on other sites More sharing options...
Members Operator Posted August 31, 2010 Members Share Posted August 31, 2010 Change power tubes, replace fuse. Check again. Careful, this can be a really quick way to blow a new set of tubes if you don't know what fried the fuse. Link to comment Share on other sites More sharing options...
Members Prehistoricpain Posted August 31, 2010 Author Members Share Posted August 31, 2010 Careful, this can be a really quick way to blow a new set of tubes if you don't know what fried the fuse. And I really don't see why the preamp tubes wouldn't light up if the power tubes were shot.. Would they? Link to comment Share on other sites More sharing options...
Members Operator Posted August 31, 2010 Members Share Posted August 31, 2010 And I really don't see why the preamp tubes wouldn't light up if the power tubes were shot.. Would they? I'd wait for someone more qualified to answer, but in my experience, when tubes or anything else goes awry, the preamp tubes tend not to light up either. Do you have another amp you can put the VTM's tubes in to see if the power tubes are shot? If the fuse looks fine, it very well might be them. Link to comment Share on other sites More sharing options...
Members Prehistoricpain Posted August 31, 2010 Author Members Share Posted August 31, 2010 I'd wait for someone more qualified to answer, but in my experience, when tubes or anything else goes awry, the preamp tubes tend not to light up either. Do you have another amp you can put the VTM's tubes in to see if the power tubes are shot? If the fuse looks fine, it very well might be them. They were the original peavey branded tubes.. soooooo. Link to comment Share on other sites More sharing options...
Members melx Posted August 31, 2010 Members Share Posted August 31, 2010 It could be so many things, it's kinda hard to just guess on a forum. Test everything you can, the power cable, the socket you have the amp plugged into, the valves in a different amp, the fuses.. if you can't find anything it's time to take it to an amp repair guy who will probably know what's wrong with it in 10 mins. Link to comment Share on other sites More sharing options...
Members Prehistoricpain Posted August 31, 2010 Author Members Share Posted August 31, 2010 It could be so many things, it's kinda hard to just guess on a forum. Test everything you can, the power cable, the socket you have the amp plugged into, the valves in a different amp, the fuses.. if you can't find anything it's time to take it to an amp repair guy who will probably know what's wrong with it in 10 mins. Word, I just thought I would run it past you guys to see if you had any other ideas I hadn't already tried. Being broke sucks! Link to comment Share on other sites More sharing options...
Members ncsu08ms3 Posted August 31, 2010 Members Share Posted August 31, 2010 This happened to my Peavey Delta Blues, flip the switch and the power light came on but not tube glow, and nothing worked, come to find out one of the tube plugs had shorted and fried my power transformer (no fuse protection on that side unfortunately) Could be a similar case here... Phillip Link to comment Share on other sites More sharing options...
Members melx Posted August 31, 2010 Members Share Posted August 31, 2010 Word, I just thought I would run it past you guys to see if you had any other ideas I hadn't already tried. Being broke sucks! yeah, I hear you.... ok, forget about the valves for now... is there a power light that should light up when you turn it on and is that dead too or does that light up? Link to comment Share on other sites More sharing options...
Members RUExp? Posted August 31, 2010 Members Share Posted August 31, 2010 I had the same issue with a Peavey Triumph 120. I changed the fuse but it didn't help so I put new power tubes in and it worked fine after that. Link to comment Share on other sites More sharing options...
Members Prehistoricpain Posted August 31, 2010 Author Members Share Posted August 31, 2010 yeah, I hear you.... ok, forget about the valves for now...is there a power light that should light up when you turn it on and is that dead too or does that light up? The power and standby lights come on fine, so that seems normal. It was my impression that if a power transformer {censored}s the bed, your amp would not get power to anything, not just the tubes. Link to comment Share on other sites More sharing options...
Members melx Posted August 31, 2010 Members Share Posted August 31, 2010 The power and standby lights come on fine, so that seems normal. It was my impression that if a power transformer {censored}s the bed, your amp would not get power to anything, not just the tubes. right, I would say tubes is a pretty good bet then to be honest. How old are they/how much use roughly? it might be getting towards the time for a full new set anyway. Link to comment Share on other sites More sharing options...
Members RoboPimp Posted August 31, 2010 Members Share Posted August 31, 2010 no problem, it's only the tubes, a couple hundred bucks and you'll be back in action! Link to comment Share on other sites More sharing options...
Members thewizardsofhop Posted August 31, 2010 Members Share Posted August 31, 2010 what if an amps cooling fan turns on but nothing else does? no standby light etc.....except the fan in the back? is that a transformer most likely? its a peavey classic 100 head Link to comment Share on other sites More sharing options...
Members MrChrisos Posted August 31, 2010 Members Share Posted August 31, 2010 I was speaking to an amp tech about the same problem (but in a different amp) just the other week. He said most often it's an internal fuse (ie not the one you'd normally check). I still play it safe when it comes to amps, messing with those can literally kill, even when unplugged, so take no risks ok? I took my amp for a service just a couple of months ago, first time I've had an amp repaired, and I was actually really pleased at how affordable it was. Link to comment Share on other sites More sharing options...
Members Prehistoricpain Posted August 31, 2010 Author Members Share Posted August 31, 2010 right, I would say tubes is a pretty good bet then to be honest. How old are they/how much use roughly? it might be getting towards the time for a full new set anyway. It looks like they are the original tubes, this is a mid 80s It looks like peavey VTM. I'll take a look and see if I can find any internal fuses that have blown, although if it had, I would assume it was from another problem, like say bad tubes. Link to comment Share on other sites More sharing options...
Members goodhonk Posted August 31, 2010 Members Share Posted August 31, 2010 from exiles, with love. Link to comment Share on other sites More sharing options...
Members SonicVI Posted August 31, 2010 Members Share Posted August 31, 2010 If the tubes aren't lighting up then there's a problem with the heater filament voltage supply. Some amps have an additional fuse on the filament supply. This amp may have one and it may be only internally accessible. I couldn't find a schematic or any internal pictures to find out. Edit: I found a schematic. The filament supply does have a fuse, labelled 'F4'. That would be the first thing I would check. Then, if the fuse is blown and blows again after being replaced then you, or better yet a tech, need to determine why it blew. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.