Bandmaster Ultra Phonix Amp

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Aaron
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Bandmaster Ultra Phonix Amp

Post by Aaron »

For those of you who haven't seen it yet.
https://reverb.com/item/5425893-dumble- ... ge-pre-cbs
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splgeo
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Re: Bandmaster Ultra Phonix Amp

Post by splgeo »

I have a higher res photo but it keeps giving me a http error
Aaron
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Re: Bandmaster Ultra Phonix Amp

Post by Aaron »

splgeo wrote: Sat Jun 03, 2017 3:47 am I have a higher res photo but it keeps giving me a http error
Try saving it first then post as an attachment
Aaron
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Re: Bandmaster Ultra Phonix Amp

Post by Aaron »

A better quality pic.
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Matt D
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Re: Bandmaster Ultra Phonix Amp

Post by Matt D »

Is that a 100k negative feedback resistor?
Matt D
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Re: Bandmaster Ultra Phonix Amp

Post by Matt D »

Looks like 10k and 470r on the tail of the PI rather than 22k and 100r. Maybe the mid and bass caps in the tone stacks are both changed to .022? The mixer resistors going into the PI look like maybe 47k?
Last edited by Matt D on Sun Jun 04, 2017 5:10 pm, edited 1 time in total.
wokkel
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Joined: Sat Mar 03, 2007 3:24 pm

Blackface Bandmaster Amp

Post by wokkel »

I thought it might be handy to have a blackface bandmaster gutshot for reference. Though it probably is not completely original either.

Besides cap-material changes, resistor material changes, there are also extra grounding spots in the UP.
And the wiring is more explicitly in 90 degree angles.

More?
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splgeo
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Re: Bandmaster Ultra Phonix Amp

Post by splgeo »

its a full marshall value PI. 470 ohm 10k 4.7k
splgeo
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Re: Bandmaster Ultra Phonix Amp

Post by splgeo »

the tone stack is the same as the blues master150k/120k plates 150k plate 2.2k cathode.... the 120kplate shared cathode 900ohm, resistor. normal channel looks like 330pf .022/.022 47k slopev1b coupling cap looks like .05uf......... vib channel 250pf .022/.022 47k slope... v2b coupling cap looks like .1uf. and a few caps added to the optocoupler.

power tube grid resistors changed too 5.1k

this is what I see
Mark
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Re: Bandmaster Ultra Phonix Amp

Post by Mark »

It's good that someone has finally cut us enthusiasts a break. I'm surprised as the circuit doesn't line up with descriptions I've read of the amp. I've mainly heard talk that it is loud and clean. Looking at the circuit I doubt it would be any cleaner sounding than a regular Fender amp.

Look forward to reading the various talk about people's findings. I expect the usual controversy around this amp. :wink:
Yours Sincerely

Mark Abbott
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norburybrook
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Re: Bandmaster Ultra Phonix Amp

Post by norburybrook »

splgeo wrote: Sat Jun 03, 2017 7:50 pm the tone stack is the same as the blues master150k/120k plates 150k plate 2.2k cathode.... the 120kplate shared cathode 900ohm, resistor. normal channel looks like 330pf .022/.022 47k slopev1b coupling cap looks like .05uf......... vib channel 250pf .022/.022 47k slope... v2b coupling cap looks like .1uf. and a few caps added to the optocoupler.

power tube grid resistors changed too 5.1k

this is what I see
The Dumble bluesmaster I built has the best clean sound of all the dumbles I've made. It's lovely and full and LOUD. If you like fender cleans then the BM is a great place to start. reminded me of a twin but nicer sounding when pushed.

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amplifiednation
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Re: Bandmaster Ultra Phonix Amp

Post by amplifiednation »

There's more than one voicing of these
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ToneMerc
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Re: Bandmaster Ultra Phonix Amp

Post by ToneMerc »

That one appears not to have PAB either.

TM
splgeo
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Re: Bandmaster Ultra Phonix Amp

Post by splgeo »

the "hotel Hog" has some differances like the normal side has typical fender values
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M Fowler
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Re: Bandmaster Ultra Phonix Amp

Post by M Fowler »

Also with BM channel add the Mega-Boost (lifting the mid pot ground).
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