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The Hundred-Buck Amp Challenge
The Hundred-Buck Amp Challenge
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Old 18th July 2011, 12:46 PM   #631
Tubelab_com is offline Tubelab_com  United States
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Quote:
Just remember-- VOTE for wdcw hahaha!
You are the clear leader so far. Love the fat tone at the very beginning of the clip.
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Old 18th July 2011, 03:11 PM   #632
Cassiel is offline Cassiel  Libya
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Love the fat tone
I'm after this fat, greasy tone. No success yet, dammit!!

‪1948 McKinney / Valco Supreme ( Supro ) guitar tube amp demo‬‏ - YouTube

I believe this is the schematic:
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Old 18th July 2011, 03:33 PM   #633
PB2 is offline PB2  United States
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Field coil speakers are used in that Valco, LOL, that is some old technology:
The Field-Coil Guitar Amplifier | Preservation Sound

Last edited by PB2; 18th July 2011 at 03:36 PM.
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Old 18th July 2011, 03:50 PM   #634
Cassiel is offline Cassiel  Libya
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The Field-Coil Guitar Amplifier | Preservation Sound
Wow! Great link. I WANT that amp.

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You are a man of the world. Bold and sophisticated. A true musical connoisseur.
Yep, that's me.
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Old 18th July 2011, 04:28 PM   #635
Wavebourn is offline Wavebourn  United States
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The Hundred-Buck Amp Challenge
Quote:
Originally Posted by Cassiel View Post
I'm after this fat, greasy tone. No success yet, dammit!!

‪1948 McKinney / Valco Supreme ( Supro ) guitar tube amp demo‬‏ - YouTube

I believe this is the schematic:
I can get such tones, but I can't play so well! Damn!
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Old 18th July 2011, 06:59 PM   #636
Trout is offline Trout  United States
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Originally Posted by Wavebourn View Post
I can get such tones, but I can't play so well! Damn!
Those old Valco's are mean, but its not a had tone to get either.


build a 5E3, LOL
Even with 6aq5's you can get that.

It defies all of the rules, split load PI, no negative feedback, plate voltages just over specs sheets.

‪Richter Tweed Deluxe - Tim Brundage‬‏ - YouTube

Last edited by Trout; 18th July 2011 at 07:01 PM.
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Old 18th July 2011, 07:13 PM   #637
Michael Koster is offline Michael Koster  United States
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That Valco sounds like a Tweed Deluxe with a pentode input stage... Sweet! Now I know what my next amp will be.
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Old 18th July 2011, 08:19 PM   #638
Cassiel is offline Cassiel  Libya
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‪Richter Tweed Deluxe - Tim Brundage‬‏ - YouTube
Not quite the same, but very similar. Gob, why I'm wasting my time with el84's. You wanted a compact chassis dumbazz, that's why. Now I'll have to start again with a bigger chassis. 717A - 6SL7 - 6V6's.
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Old 18th July 2011, 08:26 PM   #639
TheGimp is offline TheGimp  United States
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One possibility for those galvanized steel chassis is construction sites. A lot of steel is used in home construction now days and it might be possible to get scraps for free if you talk to the site foreman.

The 6P41S is proving to be a tank of a tube. I blew the bias servo circuit (Tried to run power-drive in addition to the providing power to the input stage for biasing). The MPS92 didn't like 20+ma at 100V. Once the bias went, the tube went for a run with .25A current at 250V. The plate took on a nice orange glow before I hit the breaker.

I'm putting it aside for now and going back to the 6F4P circuit.
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Old 18th July 2011, 08:44 PM   #640
Tubelab_com is offline Tubelab_com  United States
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Gob, why I'm wasting my time with el84's.
Because they ROCK.......the 6V6 sings the blues.......just my dummmazzz opinion.

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The MPS92 didn't like 20+ma at 100V.
Glad to see that I am not the only one that got some sand into my amp.

Yeah I have fried a few parts. Amp 1.0 blew up when I didn't like the sound so I spun the power supply knob to the right until it blew up. Turns out the 1/4 watt screen resistors did the job of saving the 150 volt tubes from nearly 400 volts. It's alive again but still sounds like #*^&. I think it has too many parts in it so it is becoming an exercize in Muntz design. Anyone here old enough to remember Mad Man Muntz TV sets.
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