Tube Amp & Guitar Forum

Single Channel amp - channel switcher?

lukebradley — Tue, 02 Sep 2008 19:52:45 GMT

Hi, recently got a 15 Watt Orange Tube amp. I want to use it for both rythum and lead Playing, but I don't want to be twisting knobs in the middle of a song. And I dont want to use a distortion box because the amp already has great distortion. Does anyone know of an inexpensive gadget that would tweak your amp's volume and gain remotely?

thanks, Luke

Forum: Technical Discussion

Laney 50 watt pro tube lead

mdm002 — Sat, 30 Aug 2008 20:33:00 GMT

Hey guys, this is my first post. I am trying to fix a laney head for a friend. It is very very low volume, like it can only be heard if I play an iPod through it really high and crank the pre and master. I have checked all pre amp tubes, and am clueless to what else it could be. I don't have extra el34's to check if its the power tubes. Any ideas?

Forum: Technical Discussion

groove tube and sovtek 6l6 match

paulm — Tue, 08 Apr 2008 17:33:58 GMT

I had a couple sovtek 6l6s getting microphonic on me and needed to replace for a show that evening(w/o biasing). On the sovtek the numbers 00 08 were painted near the base. The guy at the shop sold me groove tube #7s and said they should be close enough to my 8s. Recently I saw a set of sovtek 6l6s with the numbers 03 14 on them. So were we wrong to assume that 00 08 would match to groove tube #8 being that their rating does not go to 314?

Forum: Tube Topics

Power atenuator for classic 30 ?

dan2610 — Sun, 06 Apr 2008 23:36:31 GMT

Hi! Im kinda newb with tube amps. I recently bought peavey classic 30 combo 1x12 + a 4x10 peavey classic bottom. Someone told me i can use a ''power atenuator'' to get 100% of my tube potential. I understand how it work but dont know where to find 1 unexpensive or if i can find some schematic to build one myself :)

Forum: Technical Discussion

Mystery component

paully — Thur, 20 Mar 2008 15:50:40 GMT

Hi all. New guy here with question. I've seen feedback circuits in a lot of amp schemos, but this one for an Ampeg V4 adds a .001 cap in parallel with the limiting resistor. This is the only amp I've seen it on, and am wondering why Ampeg might have included it. Thanks.

Best, Paul

http://i125.photobucket.com/albums/p71/goosefat/V4.jpg

Forum: Technical Discussion

My Last Build 5E7

fatcat — Wed, 05 Mar 2008 04:24:19 GMT

Just thought I would post a couple of pics of my last build. 5E7 with Mid Control...also did mod of adding adjustable bias. Thought i would share a couple of pics.

Forum: Everything Else

PROBLEM. need help.

mmcknew — Sat, 02 Feb 2008 03:28:51 GMT

I just bought a Madison 100 watt tube amp about 2 months ago.
Now when I turn it on it works for about 30 seconds and slowly dies.
I have no idea what the problem is and it is definitely the amp and not my guitar.
If anybody knows what the problem is please help.

Forum: Technical Discussion

Sovtek tubes.

inafantasy — Fri, 01 Feb 2008 08:04:21 GMT

Okay, I recently came across some Sovtek tubes ('60's, if I remember correctly) 6L6s and 12AX7s.

So my question to you all is, where can I find a great deal on a vintage (or at least vintage flavored) tube amp chassis to throw these bad boys in?

Thanks
-Fanta

Forum: Technical Discussion

6v6 gta and a few rectifiers

joacomio — Sun, 30 Sep 2007 03:53:58 GMT

hey, im new in this forum. does anyone knows about making an small tube amp with just one 6v6 gta power tube??. i mean, i been looking to build this small amp pretendig to have only one power tube. i have some few rectifiers tubes but i dont think that i ve to worry to much about them. my problem is the amp itself, the power part.
i was thinking to build a preamp with op amps with tone controls and finding a way to mix this part to the tube part, i really dont know how to do it, and of course, i dont have an schematic of the tube part to follow. so, if anyone knows about a simple but effective tube amp with only just this little 6v6 gta tube i ll be very happy until the end of this year!!!!

Forum: Small Amps

Hot Rod Deville/ Mesa Lonestar?

Timrmcgatha — Tue, 25 Sep 2007 02:45:29 GMT

I own a Fender hot rod deville 4x10... TO me the amp is harsh sounding every thing is stock... Im in love with The Lonestar tone...but not the price..Im sure I could clean it up with a compressor but Does any one know what could be done...to acheive that spongy tone like all tube amps including the rectifier.... Less harsh... maybe 2x12s changing tubes....THanks Tim....

Forum: Technical Discussion

Gradual building up of distortion on clean channel

aharwood — Mon, 06 Aug 2007 15:09:37 GMT

I have a Fender '93 Super amp, 60W, 4x10 combo. When switched on, the amp gives a great clean sound. For about five minutes. Then slowly but surely its starts to distort, giving a fuzzy sound. If I turn down the volume on the guitar to zero, wait a few seconds, and then turn back up, the distortion is gone but it soon comes back. I'm just playing the amp at low volume (1 to 2 on the dial).

Any ideas what is the problem? I have found the schematic for this model and could try to replace parts. The guy I bought it off said it had been re-tubed about
1 year ago. It is a real pain to get to the pars because the PCB needs to be completely taken out, which means removing all the valves and a lot of screws.

Forum: Technical Support

18 watt has static-y distortion when cranked

grandpa — Thur, 14 Jun 2007 21:52:17 GMT

Hi folks, another 18watt.com refugee here.

I've got an 18 watt I built recently that sounds great until it's cranked (8+ vol). At high volumes, especially when I really lay into the strings, there's a bit of high frequency static/buzz on top of the good/tasty distortion. It's fairly subtle, but once I hear it I can't stop hearing it, if you know what I mean. It's not an obnoxious 'farting-out' kind of noise. Is this crossover distortion I'm hearing? I did try upping the cathode resistor, as the bias current seemed high, but it required a pretty large value (300ohms or so) to get rid of the static-y noise, and that also got rid of much of the good distortion.

Currtently, plate voltages are 323v, bias current is about 39ma. I'm using a 150ohm cathode resistor with a 50uF bypass cap.

Any ideas?

Thanks!

John

Forum: Technical Discussion

Speaker 8F125 Advice

BluesExplosion — Thur, 31 May 2007 16:19:22 GMT

Hi S2,
After I read your VJ upgrade instruction, it seems we like the same kind of tone.

So I've decided to put in my VJ a Weber 8F125. Here are some informations to order one of those :
Power : would you advise me a 20 W setting?
Dustcap : standard ?
Impedance : which value would you advise me ? 4, 8 or 16 ohm, assuming that I've got a Hammond 125DSE OT ?

Forum: Technical Support

Volume Pedal

nomad100 — Mon, 21 May 2007 19:23:38 GMT

I've been looking at volume pedals, are passive pedals better than active? Why do most pedals use very small value pots.

Forum: Everything Else

6L6 / KT66 question...

kwest19 — Sat, 19 May 2007 00:11:55 GMT

So, when I look on the Groove Tubes website and they display the KT66 tubes under the heading "6L6 Family" does that mean it would be reasonably easy to put KT66 tubes into a 6L6 amp?

Forum: Tube Topics