bluesmaster?

[odourboy]

Did you lower the output grid couplers to .02 in the amps you had it in?? It doesn't sound right with .1uf

Can you elaborate on this Scott? I've got .1uf in mine (oops!) and I'm curious what sort of change I should expect going to .02.

[dogears]

The .1uf had a harder and kind of harsher thing on the bottom. The .02uf seems to let the lows blossom more. THe "correct" BM value is .02 from the 4 specimans that I have seen.

[odourboy]

Well I guess I'd better try it - that brings my HRM up to version 6.

[Bob-I]

..... version 6.

Damn newbies.

[toneman]

OK, here we go, is there a schematic? Kind of hard to follow the threads .Been really busy

[heisthl]

[quote="dogears"]Did you lower the output grid couplers to .02 in the amps you had it in?? It doesn't sound right with .1uf

I have installed it in about 10 amps and every single person, bar none, really really loved it. No headroom issues and way more harmonics.

quote]
Yes I went to the .02s as part of the change. On the next build I'll try a temporary daughter board so I can do instant clip lead A/B on the exact same Iron and settings to make sure I'm not hallucinating.

[TimS]

On the next build I'll try a temporary daughter board so I can do instant clip lead A/B on the exact same Iron and settings to make sure I'm not hallucinating.

I'd be very interested in hearing that.

[Pete]

I played Scott Whyte's amp for a whole set a few years ago. At the time, Dumble had tweaked it for Scott a few times and they were looking for a good EVM 12L for it. The amp sounded fine, but not "great," to the point that I wasn't even curious to know what was under the hood. For that matter, however, while I am curious to know what's in LC's amp it is because I am a fan and not because of the sound. Having seen LC live many times, I think his best tone was up through 91 or so. After that, either the sound was too muddy and buzzy in lead mode, or he basically wouldn't play the lead channel of the amp all together. Cleans are great, though.

Gil

From recent pics I've seen, it looks like Larry is using a lot more bridge pickup than ever before. Maybe a RF influence (?)

[ayan]

From recent pics I've seen, it looks like Larry is using a lot more bridge pickup than ever before. Maybe a RF influence (?)

Or maybe the amp is way too buzzy on the neck pickup? Would be consistent with an HRM amp, IMHO.

Gil

[chris_sanford]

From recent pics I've seen, it looks like Larry is using a lot more bridge pickup than ever before. Maybe a RF influence (?)

Or maybe the amp is way too buzzy on the neck pickup? Would be consistent with an HRM amp, IMHO.

Gil

Guys... I tell you, he was getting a good sound no matter where the pickup selector was pointed. The middle position tone was especially cool!

chris

[chris_sanford]

I have installed it in about 10 amps and every single person, bar none, really really loved it. No headroom issues and way more harmonics.

Scott,

I guess I'm the 11th person then, cause I don't care for it when mixed with the normal HRM circuit. I do think it sounds great when you use the Bluesmaster front-end though... which makes me wonder if there are any Dumbles out there that have the Marshall PI but are otherwise similar to either the 80s or HRM circuits that we know about?

chris

[Funkalicousgroove]

I like it both ways, but I tend to lean towards the Bluesmaster PI with the HRM. I DO NOT like it with the 80's flavors though.

[dogears]

But isn't your amp setup with some "alternate" values?? You also have 6L6 tubes. The EL34 tubes eat this PI up.... I think you did not try the entire recipe, no? Just some of it......

I have installed it in about 10 amps and every single person, bar none, really really loved it. No headroom issues and way more harmonics.

Scott,

I guess I'm the 11th person then, cause I don't care for it when mixed with the normal HRM circuit. I do think it sounds great when you use the Bluesmaster front-end though... which makes me wonder if there are any Dumbles out there that have the Marshall PI but are otherwise similar to either the 80s or HRM circuits that we know about?

chris

[chris_sanford]

But isn't your amp setup with some "alternate" values?? You also have 6L6 tubes. The EL34 tubes eat this PI up.... I think you did not try the entire recipe, no? Just some of it......

Scott,

When I was listening to the marsh PI, my amp was stock HRM, then I converted it to Bluesmaster 2-stage od, followed by my own guess at how a single-stage od might be wired. You are right about the EL34s though, I never tried 'em... however the Dumbles with Marshall PIs (that I know about) have 6l6s, so unless you've seen different, I believe the recipe you speak of, is your own (not that there's anything wrong with that). What I generally try to do with my own amps, is to see what Dumble may have had in mind with a particular circuit. I'm not trying to reinvent or possibly improve on anything. I guess that's where you (and Andy and Gary and Alan and Brandon et. all.. come in!

chris

[Pete]

OK, here we go, is there a schematic? Kind of hard to follow the threads .Been really busy

I have no idea about the preamp/OD, never saw the "phantom" schematic (of the BM) referred to earlier.
But as for the PI, if I may steal Scott's quote from the other thread:

The resistors are standard Bluesmaster Dumble fair.
9.09K, 511ohm, 4.7K tail, and 100K feedback. 25K presence pot and .1uf cap. .02uf caps and a 47pf snubber between the plates.

so, there you have it, three basic areas.
1). the grid coupling caps to the output tubes from .1 to .02.
2). PI resistor values
3). Presence pot to 25K

I can't yet determine from all the comments if I would like it or not. It would have to not compromise max clean headroom for me to favor it. There seems to be some question about this. With those values there could be more neg FB which may help keep it clean, no?
Looks like there will be no avoiding firing up the iron one more time (it never ends ... probably some of you can relate to that sentiment )