|
|
#1
05-31-2021, 10:32 PM
|
|||
|
|||
Power tube glowing too bright???
Ok guys, So I just picked up a Strauss SVT-20R, it has two power tubes in it and one of them is glowing a lot brighter than the other one. This is a brand new amp with less than 5 hours playing time on it, is this normal to have one tube glowing this bright or is it a problem that I need to get looked at?
I've got warranty on the amp so no problem there if I need to get it looked at or sent away to be fixed I just want to know what the story is when none of the other 4 valves are glowing anywhere near this much. Let me know what you guys think. Sorry if it's a bit hard to make out in the photo It's hard to get a clear shot of the valves because of the back panel... https://imgur.com/gallery/vqdqABk 
|
|
#2
06-01-2021, 04:40 AM
|
|||
|
|||
|
I'm not an amp tech, but from what I can see from the tube amps I own and use,, to me that doesn't look right.
Maybe try unplugging it and reseating all the tubes? beyond that doing anything, I'd be a little concerned.
__________________
Ray Gibson SJ200 Taylor Grand Symphony Taylor 514CE-NY Taylor 814CE Deluxe V-Class Guild F1512 Alvarez DY74 Snowflake ('78)
|
|
#3
06-01-2021, 05:55 AM
|
|||
|
|||
|
It looks like the tube's plate/anode is red (glowing) hot. The tube is bad, the bias is too hot, or there is a more subtle problem. Bring it to a tech.
__________________
jf45ir Free DIY Acoustic Guitar IR Generator .wav file, 30 seconds, pickup left, mic right, open position strumming best...send to direct email below I'll send you 100/0, 75/25, 50/50 & 0/100 IR/Bypass IRs IR Demo, read the description too: https://youtu.be/SELEE4yugjE My duo's website and my email... [email protected] Jon Fields
|
|
#4
06-01-2021, 01:12 PM
|
|||
|
|||
|
Swap the two power tubes. If the redplating follows the tube, buy a new set. If it doesn't, the amp needs repair. Either way, that tube is now trash.
__________________
"You don't have to be great to start, but you have to start to be great." -Zig Ziglar Acoustics 2013 Guild F30 Standard 2012 Yamaha LL16 2007 Seagull S12 1991 Yairi DY 50 Electrics Epiphone Les Paul Standard Fender Am. Standard Telecaster Gibson ES-335 Gibson Firebird
|
|
#5
06-01-2021, 01:47 PM
|
|||
|
|||
|
If you can still return it I would do so and get another. If it's past the return period than have it repaired under warranty.
__________________
Patrick 2012 Martin HD-28V 1984 Martin Shenandoah D-2832 2018 Gretsch G5420TG Oscar Schmidt Autoharp, unknown vintage ToneDexter Bugera V22 Infinium
|
|
#6
06-01-2021, 02:46 PM
|
|||
|
|||
|
Yeah a problem, kiss of death for the tube. You could try re-seating the tubes as said, swap them will tell you if it is a tube problem or that side of the amp. Either case it is wrong, I would take the amp back if possible.
__________________
Fred
|
|
#7
06-02-2021, 01:10 AM
|
|||
|
|||
|
Ok so just as an update it wasn't the tube it was something in the amp.... i took it back to my store and we swapped the power tubes around.... same position was glowing too bright so it wasn't the tube.
I've got a replacement amp in the mean time that's the exact same amp and working beautifully... I checked the tubes and they're all glowing evenly and none too brightly... the amp even sounds a lot better than the one i just took back. so that amp definitely had a problem in it somewhere... I guess I can welcome myself to the wonderful world of tube amplifiers =P
|
|
#8
06-02-2021, 05:55 AM
|
|||
|
|||
|
Quote:
Tube amps are great things, but they are bit more involved with caring and maintaining them. But IMHO worth it, 100%
__________________
Ray Gibson SJ200 Taylor Grand Symphony Taylor 514CE-NY Taylor 814CE Deluxe V-Class Guild F1512 Alvarez DY74 Snowflake ('78)
|
|
#9
06-02-2021, 06:31 AM
|
||||
|
||||
|
Quote:
__________________
Enjoy the Journey.... Kev... KevWind at Soundcloud KevWind at YouYube https://www.youtube.com/playlist?lis...EZxkPKyieOTgRD System : Studio system Avid Carbon interface , PT Ultimate 2023.12 -Mid 2020 iMac 27" 3.8GHz 8-core i7 10th Gen ,, Ventura 13.2.1 Mobile MBP M1 Pro , PT Ultimate 2023.12 Sonoma 14.4
|
|
#10
06-05-2021, 09:20 PM
|
|||
|
|||
|
Quote:
|
|
#11
06-05-2021, 09:22 PM
|
|||
|
|||
|
Quote:
|
|
#12
06-06-2021, 02:57 PM
|
|||
|
|||
|
Quote:
|
|
#13
06-13-2021, 10:01 AM
|
|||
|
|||
|
I had a head in for warranty repair - it was returned from the manufacturer with new tubes and packaged as they would send them out ... they'd burned in the new tubes for several hours to test it. Within about an hour of playing it a tube blew along with the fuse ... new tube and it's run like a champ - so even with a careful factory test and packaging - shipping tube amps is always frought with a little peril - the shaking etc... and the tube in question may have been OK sitting still but slightly out of spec that was revealed after the bumping etc.. of a cross country trip.
A bad tube is always a good starting point regardless but I'm glad you were able to discover it was a circuit issue and get a replacement. Nothing sounds like tubes but they do have a level of fiddle factor from time to time.
__________________
Taylor 517e Yamaha AC3R PRS Custom 22 semi special PRS Custom 24 Rickenbacker 330 Teles (too many) Bad Cat Cub III 30R Goodsell Super 17 Vintage Sound VS22 Too many pedals!
|
