Tim Pierce and ODS #178

[DSull89]

Found some shots of the chassis, too.

[Guy77]

Thanks for posting these picks Dan.
Those are Svetlana 6L6GC power tubes.
I have a set in my basement that are an exact match to those in your photos.

The gold print on the tubes in your pic was the give away!
Its seen in the 2nd tube from the right in the 4th pic you posted.

The construction of the tube is also an exact match.
I have heard the Svetlana's can also handle high voltages. Now we know its true!


Cheers
Guy

20241006_002351.jpg

[DSull89]

Good eye, Guy! Good to know there are still some tubes out there that can handle the high voltages that some of these amps have. Here’s the link to the sale listing for 178 that I screenshotted those pics from.
-Dan

https://www.technoempire.com/dumble-ove ... tana-54883

[dbharris]

Dan, thanks for adding the additional pictures. Guy, I appreciate your comments. I think there may be a musicman Ultra-Phonix/Bluesmaster in my future. But I still need to build a "low plate classic" next.

I thought with HAD's passing, we may have seen more people sharing info and photos than ever before. But that doesn't seem to have panned out, except of course the usual suspects around here who are always generous in that manner.

-Dan

[DSull89]

You’re very welcome for the pics, Dan! Glad I could contribute something to the forum. Funny, I was thinking the same thing. I’m gearing up for my first ODS build with a 100w 2nd Gen using old Peavey Deuce iron but would definitely be interested in building something like 178 next. Has anybody ever made a layout for this type of circuit?
-Dan

[dbharris]

There is enough info across a couple of threads to build the musicman power supply. One thread I remember has an "improved" version for better reliability of modern electrolytic caps. I don't recall seeing anyone post a full layout though. Maybe the high voltage was a concern....I dunno.

Let me know if you can't find the threads with search.

-Dan

[Guy77]

You’re very welcome for the pics, Dan! Glad I could contribute something to the forum. Funny, I was thinking the same thing. I’m gearing up for my first ODS build with a 100w 2nd Gen using old Peavey Deuce iron but would definitely be interested in building something like 178 next. Has anybody ever made a layout for this type of circuit?
-Dan

Hi Dan. The Ripper.pdf file posted on the first page here is the schematic that would be a close approximation for this circuit.
A good alternative if you did not want to use the high 700v in the power supply is to build it with a 100 watt Marshall transformer that could get you close to 500v.

edit..
I just realized you mentioned layout and not schematic. I actually build from schematics but yes a layout would be good too.
At least this is a good starting point.

Cheers
G

[DSull89]

Thanks, Guy! I’m no good with schematics so maybe I’ll just stick to the circuits with layouts and leave the heavy duty builds like 178 to the seasoned builders. That 700v is kinda intimidating for somebody like me, gotta admit. I can see from the numerous build threads on here that any of these designs are hard enough to pull off even with the aid of a well drawn diagram. Let’s see how much trouble my 2nd Gen build gives me.
-Dan

[talbany]

Here are 2 separate 700V power supplies from 2 different amps
One being The Tan Ultrasound MM/ Bruno super 100 (clone)
the other one is ODS019X. ( IIRC)

WARNING! For the newbies out there this amp will kill you if you don't know what you are doing!

Tony

[talbany]

Oh BTW..Carlton used the Sovtek's
The Winged C's will also handle the 700.
(IMO Wing C's a better sounding tube but mo expensive)

Larry Carlton uses Sovtek 5881's and JJ ECC83s fwiw-

Robbens amps had JJ preamps, one had the 5881 output tubes, one had either Svetlana's (Reflektor prod.) or winged C's, I couldn't see any manufacturer label-but they did have orange GT stamps on them.

Tony

[Guy77]

Oh BTW..Carlton used the Sovtek's
The Winged C's will also handle the 700.
(IMO Wing C's a better sounding tube but mo expensive)

Larry Carlton uses Sovtek 5881's and JJ ECC83s fwiw-

Robbens amps had JJ preamps, one had the 5881 output tubes, one had either Svetlana's (Reflektor prod.) or winged C's, I couldn't see any manufacturer label-but they did have orange GT stamps on them.

Tony

Thanks for all this great info Tony!
Yes Winged C are great tubes and probably have more headroom than the Sovtek's.

The Svetlana tubes are great too. I noticed I need to run the Svetlana tubes hot and then they sound amazing.
I was running then cold at only 55% but when I took them closer to 70% they gave up the goods!
Will have to build this when I have time.

Cheers
Guy

[Funkalicousgroove]

Hello Guy
Good to be back with you guys here.
Sounds more Marshall/Bluesmaster esque to me (Scooped mids) givin the amps settings.

Maybe CW can opine?

Tony

I have learned a few things recently so yes; I can respond to this. First of all, we need to differentiate between "power amp" and "power supply" as Dumble refers to them. The "power amp" is the output tubes, PI, and output transformer. The "power supply" is the power transformer, rectifier, and filtering. Yes, Dumble gave names to the power amp, and I know of two although there may be more. The "surge" power amp is the Marshall style output section as used in the Bluesmaster and Ripper. The "precision" power amp is the output section we are more familiar with like #124, #102, and so on. I believe that years ago there was a confusion between a precision power amp and precision power supply. I do not think Dumble ever called the radial cap etched board, a precision power supply. I also do not think that Dumble would have to referred to a complete amp with names like Bluesmaster or Ripper. Those are names he gave to what he calls the overdrive processor section of an amp. So, for example, #189 would be a skyline preamp with a ripper overdrive processor and a surge power amp. I believe in this #178 amplifier the preamp is the Marshall style preamp that apparently Dumble called the "Ultraphonix".
CW

Hi

Surge power section= 700V music Man power transformer

Tone blossom power amp = the Marshall style phase inverter

Bluesmaster, ripper, and ultraphonix clean preamps are all unique voicings, and while somewhat similar, each have their own unique twists.

HRM Type II = cathode follower driven tone stack.

LC overdrive is most likely referring to the Black amp’s final circuit, which is a single gain stage with a DC coupled cathode follower ala Marshall super Lead. His 2 amps were both rippers, but they were quite different. The Tan amp was big and rumbly, with a giant tweed bassman like low end, whereas the black one was more lean and polite with less gain and fur around the edges.

[talbany]

Hello Guy
Good to be back with you guys here.
Sounds more Marshall/Bluesmaster esque to me (Scooped mids) givin the amps settings.

Maybe CW can opine?

Tony

I have learned a few things recently so yes; I can respond to this. First of all, we need to differentiate between "power amp" and "power supply" as Dumble refers to them. The "power amp" is the output tubes, PI, and output transformer. The "power supply" is the power transformer, rectifier, and filtering. Yes, Dumble gave names to the power amp, and I know of two although there may be more. The "surge" power amp is the Marshall style output section as used in the Bluesmaster and Ripper. The "precision" power amp is the output section we are more familiar with like #124, #102, and so on. I believe that years ago there was a confusion between a precision power amp and precision power supply. I do not think Dumble ever called the radial cap etched board, a precision power supply. I also do not think that Dumble would have to referred to a complete amp with names like Bluesmaster or Ripper. Those are names he gave to what he calls the overdrive processor section of an amp. So, for example, #189 would be a skyline preamp with a ripper overdrive processor and a surge power amp. I believe in this #178 amplifier the preamp is the Marshall style preamp that apparently Dumble called the "Ultraphonix".
CW

Hi

Surge power section= 700V music Man power transformer

Tone blossom power amp = the Marshall style phase inverter

Bluesmaster, ripper, and ultraphonix clean preamps are all unique voicings, and while somewhat similar, each have their own unique twists.

HRM Type II = cathode follower driven tone stack.

LC overdrive is most likely referring to the Black amp’s final circuit, which is a single gain stage with a DC coupled cathode follower ala Marshall super Lead. His 2 amps were both rippers, but they were quite different. The Tan amp was big and rumbly, with a giant tweed bassman like low end, whereas the black one was more lean and polite with less gain and fur around the edges.

Hello Brandon
Good to see you poating again!

Tony

[DSull89]

At 8:50 Tim says #178 has HRM.

https://m.youtube.com/watch?v=oi2aeMzZr ... aWVyY2U%3D