SRV in the studio with his SSS

[Aaron]

Just saw this posted on an SRV site.
Stevie playing his SSS with 4x12 cab. Look like no others amps being used.
Beautiful tone.
https://youtu.be/cabNuMtLeXA

Aaron

[Bombacaototal]

Great find and thanks for sharing!

[MeanMrMustard]

Very cool!

[Bombacaototal]

BTW it is insane the amount of buzz/hum his amp is producing

[norburybrook]

BTW it is insane the amount of buzz/hum his amp is producing

it's a 100w tube amp, dimed, with him sat in front of it with a strat that's normal



M

[jelle]

I don't think its the amp that's 'producing' it. It sounds like its from the single coil pick ups, like Markus said. Also, the compression/leveling effect of that recording will make it sound much worse.

jelle

[Charlie Wilson]

I have played Strat so long I like that sound.
CW

[pompeiisneaks]

I guess I'm spoiled, my strat has lace sensor pickups, so no hum

My tele seems to not have much in the way of that, luckily.

~Phil

[talbany]

BTW it is insane the amount of buzz/hum his amp is producing

it's a 100w tube amp, dimed, with him sat in front of it with a strat that's normal



M

4 X 6550's running class AB2 will deliver around 160 watts of clean power no sweat. My SSS runs 4 KT-100's and there is no way I could "dime" the thing and stand in front of a 4X12 cab loaded with EV-L's without hearing damage. I have never been able to get mine past noon and be in the same room. These amps are LOUD and proud!

BTW. Around 57 sec into it he hits what looks to be a push-pull pot on the lower tone control knob. I wonder how Charlie has Scotch wired? SRV has been known to run dummy coils

Screen Shot 2014-06-16 at 1.25.33 PM.png

Tony

[stelligan]

Sax player I gigged with in the 80's did a show with him and gave me an old cassette to rescue and digitize. Turned out OK for a hand held cassette recorder stage right. He said it was the loudest guitar he had ever heard. Multiple Marshalls pointed down a hallway on other side of stage also.

RIP http://www.jonesin.org/Dave/SRV/4_SuperWillie.wav

[Max]

... 4 X 6550's running class AB2 will deliver around 160 watts of clean power no sweat ...

Hi Tony,

in your picture of the back of this amp you'll see the two Dumbleland-Special transformers (PT and OT - see the pictures of DL #009 posted in some threads here e. g.). And AFAIR this 'Dumbleland-configuration' delivers somewhere between 130W and 150W - of course depending on the amount of harmonic distortion specified as "clean".

BTW 1: AFAIR the power amp of the 150W 'blackface' SSS Colin James ordered and played (later owned and played by Kirk Hammett for some time) has the same kind of 'Dumbleland-configuration'.
BTW 2: In regard to the class of operation it might be of interest, that on the back of ODS 150W #0121 (DL PT and OT, too) A. Dumble specified an idle current of 125 mA for each pair of 6550A (see the attached picture).

121_010.jpg

All the best,

Max

[norburybrook]

yep , he was LOUD.....I toured with him in the 80's my band opened up for his european tour. I got to play with him which was nice, I still have the SRV tour passes on one of my road cases. The first night when I got to the venue to sound check he was soundchecking . His rig seemed just like a pile of amps and speakers but man, the volume, I'd never heard anything that loud before His tech spent a lot of time fixing stuff on that tour, he was always blowing speakers and amps seemed to need constant attention too, perhaps not the Dumble

We had a great tour and got to know SRV, Tommy and Chris well, it was very sad when I head the news of his death and of course the time I got to play with him is now a special memory. People also forget there were other killed in that crash too and i knew Nigel one of the security guys who died that night.

@tony, I noticed the same thing with the push pull, but I wasn't aware of any sound change, the dummy coil would be a good explanation.


this clip s a great find though.


M

[talbany]

... 4 X 6550's running class AB2 will deliver around 160 watts of clean power no sweat ...

Hi Tony,

in your picture of the back of this amp you'll see the two Dumbleland-Special transformers (PT and OT - see the pictures of DL #009 posted in some threads here e. g.). And AFAIR this 'Dumbleland-configuration' delivers somewhere between 130W and 150W - of course depending on the amount of harmonic distortion specified as "clean".

BTW 1: AFAIR the power amp of the 150W 'blackface' SSS Colin James ordered and played (later owned and played by Kirk Hammett for some time) has the same kind of 'Dumbleland-configuration'.
BTW 2: In regard to the class of operation it might be of interest, that on the back of ODS 150W #0121 (DL PT and OT, too) A. Dumble specified an idle current of 125 mA for each pair of 6550A (see the attached picture).


121_010.jpg


All the best,

Max

Hey Max
IMO the 150W rating you mention sounds about right for a quad of 6550's running AB1 fixed bias. (Tung Sol datasheet puts them at 77 watts for a pair max plate dissipation @ 450 Plate volts) Class AB2 is a more efficient method of driving the output tubes by completely eliminating the grid clamping, and allow the full excursion from the PI to drive the output tube grids. The result? More output power, and no blocking distortion, therefore, more headroom. So IMO an amp with 4X6550's running at a 500V Plate voltage(ala #121) in AB2 labeled 150 watts would be IMO a rather conservative estimate on the 6550's. in Todd's amp.(BTW. Most tube data sheets do not specify class AB2 for the 6550. I have only seen it on the 6l6 GC sheets.)
Perhaps the 150W rating he used was due to the Max power handling on the Output transformer??? This is a guess!.

As far as the bias setting in 121 goes. Yes I know!. We already discussed this in great detail before. But thanks for the reminder.
https://ampgarage.com/forum/viewtopic.p ... as#p219871

Tony

[Roe]

an amp with 4X6550's running at a 500V Plate voltage(ala #121) in AB2 labeled 150 watts would be IMO a rather conservative estimate on the 6550's. in Todd's amp.

Yes, but it really depends on transformers. First, that grey PT seems speced for 400VAC, or roughly 550VDC. the clips of Dumbleland #009 suggests high voltage to my ears.

Second, 150w is conservative given a reflected primary impedance of ca 2200 ohm and 500+v. But these amps seem to have dynaco transformers (as mentioned above). yet the OTs certainly do not look like A451a or A450s. Rather, they look like A431s, suggesting a 4300 ohms reflected primary impedance. This would reduce the power with ca 30%

[talbany]

an amp with 4X6550's running at a 500V Plate voltage(ala #121) in AB2 labeled 150 watts would be IMO a rather conservative estimate on the 6550's. in Todd's amp.

Yes, but it really depends on transformers. First, that grey PT seems speced for 400VAC, or roughly 550VDC. the clips of Dumbleland #009 suggests high voltage to my ears.

Second, 150w is conservative given a reflected primary impedance of ca 2200 ohm and 500+v. But these amps seem to have dynaco transformers (as mentioned above). yet the OTs certainly do not look like A451a or A450s. Rather, they look like A431s, suggesting a 4300 ohms reflected primary impedance. This would reduce the power with ca 30%

Yep I was thinking transformers as well. It would be nice to get in there and take some measurements, My point was on the 6550's. AFAIK. Dumble usually liked to run his 6550's at or around 500v. However don't hold a gun to my head if there happens to be one out there thats lower. Just what I heard from those who have been in a few:?

Tony