one-wire mod completed

5150loveeddie · Post by **5150loveeddie** » Wed Jan 18, 2006 3:10 pm

Nop.............but might as well do them anyways...........I'll try to find a pic for ya.......

Just for your info anytime you want to increase the gain specially in a super lead type amp will increase your chances of getting PO, and sometimes the only cure is to reduce the gain a lot

....

Let's hope we find a cure for yours.....

I found some more tricks BTW but they are more complicated to do...

heres one that may work.....(still easy..)

Increase your cathode resistor a little at V1 (I guess you have the stock 820ohms so try a 1.1k there first then a 1.5k there...), that will rebias the V1 with a hair less gain and it might be just what you need, I think your problem comes from the pre amp section, you will regain more dirt when cranking the amp from the output section

a more complicated one would be to displace your output tranny to an other location on the chassis, turn it around, mouve it an inch away till you find the best spot that reduce the squealling....note: the output must be as far as possible from the input jack....

archer · Post by **archer** » Wed Jan 18, 2006 5:23 pm

well the foil under the chassis pretty much solved the problem...i can try the cathode resistor and i'll see what it does, but the foil cut the squeal completely, even when i put the 100k back on and put the nfb to the 4ohm tap. i'll post some clips so ya'll can hear how it sounds.

5150loveeddie · Post by **5150loveeddie** » Wed Jan 18, 2006 11:33 pm

archer wrote:well the foil under the chassis pretty much solved the problem...i can try the cathode resistor and i'll see what it does, but the foil cut the squeal completely, even when i put the 100k back on and put the nfb to the 4ohm tap. i'll post some clips so ya'll can hear how it sounds.

Fantastic!!! Glad its working good now!!!

archer · Post by **archer** » Thu Jan 19, 2006 9:17 pm

here's some clips for ya. got the usual riffs in it just so you get the idea. i'm playing through a fender 300w 4x12 with my '72 sg all original. the mic is a shure going straight into my pc for easy setup. everything on the amp is up to 10...maybe 11

5150loveeddie · Post by **5150loveeddie** » Fri Jan 20, 2006 12:27 am

From that recording it is hard to tell really but the amp seems to be stable!!

How do you like?

Was that clips with the extra jack in for extra crunch?

archer · Post by **archer** » Fri Jan 20, 2006 8:33 am

it's really stable. it get some massive feedback when i want it and if i throw both volumes down to about halfway or less, i get a real sparkly clean with a trace of dirt on the outer edges. it sounds great and doesn't get the life sucked out of it by a pedal. the extra jack was in for the crunch.

archer · Post by **archer** » Sun Jan 22, 2006 11:45 pm

thanks for the help guys. if anyone wants info on the mod i think we might be able to handle it now that we have some experience with it and at least we know it works and does what it should.

5150loveeddie · Post by **5150loveeddie** » Sun Jan 22, 2006 11:49 pm

Very cool!!!!!!!

BashCoder · Post by **BashCoder** » Sun Jan 29, 2006 1:32 am

novosibir wrote: DANGER !!!
If you can hear the sound coming out of your amp, but NOTHING is coming out of your cabinet, then you're hearing your OT singing.

That means, that all is ok inside your amp, except the way from the OT's secondary to your cabinet.

Tonight I started to burn in my amp with an 8 Ohm THD Hot Plate and an 8 Ohm cabinet behind that. With all the amp controls dimed, I could hear some of that faint "singing" from the amp. Everything was definitely OK to the Hot Plate and to the speaker. Is that normal? Just in case, I think I'll burn in without the output tubes for now...

novosibir · Post by **novosibir** » Sun Jan 29, 2006 10:14 am

BashCoder wrote:... I could hear some of that faint "singing" from the amp. Everything was definitely OK to the Hot Plate and to the speaker. Is that normal?

Don't worry! When your amp delivers sound plugged into a cabinet - and plugged into a dummy load you still can hear the OT singing, when you're playing hard and the amp is pretty cranked open - thats normal.

Then you can hear the vibrations from the primary windings, because they are not all wound very tight and OT's usually aren't vacuum filled with wax or varnish, to "fix" the windings. Either they are only dived, or completely dry inside.

Larry

BashCoder · Post by **BashCoder** » Sun Jan 29, 2006 10:27 am

Great -- I was hoping that was the case. Thanks for the info!

archer · Post by **archer** » Sun Jan 29, 2006 3:21 pm

been working on the amp some and decided to go ahead and do the shielded cable. everything has cleaned up real nice with the extra cable. i would definately recommend shielding when doing this mod. i shielded v1 to grid, grid to inputs and also the 1m resistor to the vol I pot. i'm going to shield the input loops later today and clean it up some more. the only pain the ass is stripping the cable.

erigm · Post by **erigm** » Wed Feb 01, 2006 10:48 am

Ok, maybe I missed it earlier in the thread, but does the normal channel go first or the bright channel? Anyone have a schematic on hand they could email to me?

erigm

Billy Batz · Post by **Billy Batz** » Wed Feb 01, 2006 10:55 am

BashCoder wrote:Great -- I was hoping that was the case. Thanks for the info!

That OT noise is really loud in 100Wers and dictates the level I can play at. When I biamp my rig if it gets too low the OT noise really makes it hard to play.