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150W Garage sale find.
150W Garage sale find.
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Old 6th May 2005, 12:21 PM   #1
Trout is offline Trout  United States
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Default 150W Garage sale find.

Sometimes life is good!!

My sweety calls me on the phone yesterday from a garage sale,
AND

Hun> " Hun? Im at this garage sale and theres one of those amplifer thingies like you have in the garage here,, It has Tubes and its heavy, Want It?? "

Me> " Whats it look like? How Much?? Does it have speakers?? "

Hun> "The garage sale guys laughing at me because I can barely lift it to flip it over to see in the back. He says $5.00 he will take $5.00 "

Me> " Can you describe it a little more? "

>Hun " Its black, It has handles on it, lots of knobs and It has tubes, Should I bring it home?? I offered him $3.00 But he is insisting on $5.00 "

>Me " YES, Buy It "

Hours later, My Gal is home(power garage saler)
Hey, You can get that heavy thing outta the trunk of my Pt Cruiser, I lugged it here!!

Oh My,
A 1971 maybe 1972 UNIVOX U1511 150W Head Only ! Sadly, The Quad of 6550's are missing But, Still has All the original 12AX7's as well as the 12AU7's And a 6AN8 ALL Mullards.

Has Me thinking, I have a couple nice quads of el34's here, The 6550's are fairly expensive, How Hard can it be to Mod it for el34s?,

I found SOME info Here on the Amp History UNIVOX

1511 - same as 1011 except with 4 6550 and 150W output.

OK the 1011 uses 6L6's

1010/1011 (1) ($605) - separate w/ 10 tubes, 105 W, 2 channels, 4 inputs, bright and normal for each channel, volume for each channel , bass, middle and treble shared on both. presence, reverb, tremolo speed and intensity, variable impedence (8/16ohm) and a cabinet w/ 8 10" Univox Special Design speakers. Volume for channel one also had "Pull HB", a brightness/boost selector. Also has a 2-4-6 ohm switch on the back, as well as 4 separate speaker outputs, and two foot switch inputs. The handles are located on top of the head. The 1010 came with the 1011 (amp) and the 2080 (cab).

Any Advice would be helpful.
Gene
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Old 6th May 2005, 12:54 PM   #2
Sherman is offline Sherman  United States
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No advice, just a comment. Whenever I ask my wife to describe something the very first word out of her mouth is the color of the thing regardless of what it is.

Last fall when she was looking to get a new car I asked her what kinds she was interested in. Her answer- "A blue one with a camel interior."
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Old 6th May 2005, 01:07 PM   #3
chris ma is offline chris ma  Canada
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Quote:
Originally posted by Sherman
No advice, just a comment. Whenever I ask my wife to describe something the very first word out of her mouth is the color of the thing regardless of what it is.

Last fall when she was looking to get a new car I asked her what kinds she was interested in. Her answer- "A blue one with a camel interior."
Oh, and she forgot to tell you that it has one or two humps?

The Butcher
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Old 6th May 2005, 01:48 PM   #4
Trout is offline Trout  United States
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Quote:
Originally posted by Sherman
No advice, just a comment. Whenever I ask my wife to describe something the very first word out of her mouth is the color of the thing regardless of what it is.

Last fall when she was looking to get a new car I asked her what kinds she was interested in. Her answer- "A blue one with a camel interior."

HAHAHA,
Mine just read the post,, She thinks im picking on her but laughing!!
Gene

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Old 6th May 2005, 02:33 PM   #5
jlsem is offline jlsem  United States
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Quote:
Has Me thinking, I have a couple nice quads of el34's here, The 6550's are fairly expensive, How Hard can it be to Mod it for el34s?,
Come on, they aren't that expensive. You got a guitar amp head for practically nothing and you didn't even have to do the work Spring for the 6550's (Winged C are the best), and restore the thing.

John
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Old 6th May 2005, 05:28 PM   #6
Giaime is offline Giaime  Italy
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A quad of 6550s for 150W would be either class B ultralinear with tons of feedback or very high plate voltages.

In both cases I would not replace them with EL34s. They would sound awful (for deeper class B operation because of reduced max plate dissipation) or just c**p out (for too high voltage, maybe on the screen).

What about a single couple of 6550, and a mod to the impedance selector of the OT? You should save a few bucks... and have a 60/70W. you aren't gonna need 150W for your guitar.

Bye! you're lucky (to have a wife that would carry a heavy dirty tube amp head to home, and to have found a tube head for 5$).
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Old 6th May 2005, 08:15 PM   #7
Trout is offline Trout  United States
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Quote:
Originally posted by jlsem


Come on, they aren't that expensive. You got a guitar amp head for practically nothing and you didn't even have to do the work Spring for the 6550's (Winged C are the best), and restore the thing.

John

I think Im going to head in that Direction, I have a seymour duncan convertable 100w with a quad of el34s, A Homebrew PP 6V6st setup about done. Guess by then I'll be ready for a restore job.
I still have as of yet to put any meters on the Univox to check it out. I do know at this point the output tube sockets will most likely need replaced (less than pretty) And Im sure the caps should be done.

One thing nice( And not so nice) was the layout underneath, Easy socket access/not so nice printed circuit for the rest.

Heres a Peek
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.


Funny,, I look at the filament wiring and now wonder why my 6V6 project was picked on LOL.

Gene
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Old 6th May 2005, 09:33 PM   #8
Tekko is offline Tekko
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You cannot go from a quad 6550 to a duplet 6550 without changing the OPT as the plate to plate impedance till be too low for two. With a quad 6550 you have a OPT that is about 1.5-2k PP, wuth a duplet 6550 you need a OPT with about 4-5k PP.
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Old 7th May 2005, 02:52 AM   #9
Trout is offline Trout  United States
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After searching for a while, And checking a few forums,
It is the general concensus that the U1511 is basically a beefed up version of the U1011 And notice the photo above shows in fact, It does utilize the same basic circuit board, Though Im certain there were vastly different componet values .

But Me Still wonder about going to EL34's

Only because I have them .
Gene
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Old 7th May 2005, 04:22 AM   #10
Enzo is offline Enzo  United States
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If yu pull two tubes, all you do to get the impedance right is use the next lower impedance output - plug the 8 ohm load into the 4 ohm jack. This is done all the time in guitar amps.

I Googled the model and found forums.univox.org I didn't go there, but it has possibilities for you.

I'd stick with all four tubes. Remember, this is a guitar amp, not a stereo. Guitar amps routinely exceed data sheet specs on tubes. We don't expect the tubes to last years, and we are not going for zero distortion.
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