Correction:
I think I have .05uF rather than .02uF.
I was in my #183 mode then.
I definitely like the lower couplers.
The .1uF is too fat for me.
why use bluesmaster pi
Moderators: pompeiisneaks, Colossal
Re: why use bluesmaster pi
Tom
Don't let that smoke out!
Don't let that smoke out!
Re: why use bluesmaster pi
That's because it's now a Tweed output sectionrogb wrote:WOOOOOOAAAAAHHHH!
I wouldn't have believed changing a few parts could transform an amp like that!
Single notes feedback at will as do chords, but you can clean up with a turn on the volume pot.
It really has got that UP feel now, if you crank it with the 339, it's well into Marshall/dimed Tweed territory.
With the Strat, it definitely has an EJ vibe going.
I haven't even tried it with delay and reverb yet.
Amazing!
The Vib channel has more gain now, as you might expect with all the PI changes, but a touch on the guitar volume gets it really clean again.
Very versatile with an ABY box changing channels.
The 220K resistors to which I refer are indeed the channel mix resistors.
Glad you are happy with it!
Bill
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martin manning
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Re: why use bluesmaster pi
Most Fender tweed amps had 0.1uF PI output couplers...
Re: why use bluesmaster pi
Ever needed to add grid stoppers to the PI, Bill?wjdunham wrote:That's because it's now a Tweed output sectionrogb wrote:WOOOOOOAAAAAHHHH!
I wouldn't have believed changing a few parts could transform an amp like that!
Single notes feedback at will as do chords, but you can clean up with a turn on the volume pot.
It really has got that UP feel now, if you crank it with the 339, it's well into Marshall/dimed Tweed territory.
With the Strat, it definitely has an EJ vibe going.
I haven't even tried it with delay and reverb yet.
Amazing!
The Vib channel has more gain now, as you might expect with all the PI changes, but a touch on the guitar volume gets it really clean again.
Very versatile with an ABY box changing channels.
The 220K resistors to which I refer are indeed the channel mix resistors.
Glad you are happy with it!
Bill
Re: why use bluesmaster pi
No, I have not ever added stoppers to the grids of the PI. Do you feel you need them for HF rolloff or to prevent an oscillation of some sort?rogb wrote:Ever needed to add grid stoppers to the PI, Bill?wjdunham wrote:That's because it's now a Tweed output sectionrogb wrote:WOOOOOOAAAAAHHHH!
I wouldn't have believed changing a few parts could transform an amp like that!
Single notes feedback at will as do chords, but you can clean up with a turn on the volume pot.
It really has got that UP feel now, if you crank it with the 339, it's well into Marshall/dimed Tweed territory.
With the Strat, it definitely has an EJ vibe going.
I haven't even tried it with delay and reverb yet.
Amazing!
The Vib channel has more gain now, as you might expect with all the PI changes, but a touch on the guitar volume gets it really clean again.
Very versatile with an ABY box changing channels.
The 220K resistors to which I refer are indeed the channel mix resistors.
Glad you are happy with it!
Bill
Bill
www.sebagosound.com
Re: why use bluesmaster pi
No, not really, I know they can be used on cathodyne PIs. I wondered if they might add some smoothness to the extra gain now present.wjdunham wrote:No, I have not ever added stoppers to the grids of the PI. Do you feel you need them for HF rolloff or to prevent an oscillation of some sort?rogb wrote:Ever needed to add grid stoppers to the PI, Bill?wjdunham wrote: That's because it's now a Tweed output section
The 220K resistors to which I refer are indeed the channel mix resistors.
Glad you are happy with it!
Bill
Bill
www.sebagosound.com
Probably rolling a bunch of tubes would provide better results
Regarding the changes to the PI, using .02s, along with the 47pF and the 100K NFB is pure Marshall, rather than Tweed IMO.
Re: why use bluesmaster pi
59 Tweed Bassman 4x10 is very close to that PI.
Re: why use bluesmaster pi
Yes, apart from the 5F6A....M Fowler wrote:59 Tweed Bassman 4x10 is very close to that PI.
The inspiration for the JTM45.I think the .02s make it more Marshally.
Last edited by rogb on Tue Oct 01, 2013 4:32 pm, edited 1 time in total.
Re: why use bluesmaster pi
Looks close to an Express PI as well. I've found that a tone stack lift is a lot of fun when using this type of PI.
Re: why use bluesmaster pi
For sure, I have the lift on a push-pull pot. Takes off like a Hawker Harriermhartman wrote:Looks close to an Express PI as well. I've found that a tone stack lift is a lot of fun when using this type of PI.
Re: why use bluesmaster pi
On my quad 6V6 HRM I have a P/P mid pot that lifts the TS, love it.rogb wrote:For sure, I have the lift on a push-pull pot. Takes off like a Hawker Harriermhartman wrote:Looks close to an Express PI as well. I've found that a tone stack lift is a lot of fun when using this type of PI.
TM