bluesmaster

[bigmik]

hey guy's
I just converted my HRM to a bluesmaster and have a few tone stack questions that I hope someone can help with . since the changes the amp is really bass heavy in rock mode and the bass control has little or no affect on reducing the lows. In jazz mode there is less bass but the control only appears th have an affect in the last quarter turn[3-5] .Is this normal for the bluesmaster tone stack or do I have a problem?
also since the changes to the prescence control it doesn't have the range of the old circuit ,is this normal?

thanks

neil

[Normster]

Make sure you've swapped all necessary components when converting from HRM to BM. V1b coupling cap - .01uF, cathode cap - 1uF, V2a coupling cap - .001uF, 47pF bypass cap on the 470k, etc. If that doesn't tighten things up, you can swap the 500KA pot for a 250KA.

[dogears]

I prefer a .015uf or .02uf for V1B coupling. DUmble used both .01 and .02 there. For me, a .002 on V2A is much better. I did not like the .001uf there.

Make sure you set the OD trimmer very low. If it is much over about 20K, you will have too much bass. This is crucial!

Set the HRM stack with the bass very very low. Maybe 70k. Set the mids extremely low. Try 4K as a ballpark to start at. Treble about 45% on.

All bypass caps are 4.7uf. I have never seen a 1uf there in a Bluesmaster, and I hated the sound of it when I tried it. My Glaswerks is a Bluesmaster and I have fat switchs on both V1B and V2B that toggle between 1uf and 5uf. I much prefer 5/5 at all times. No contest.

Double check you presence circuit. It works well when wired correctly. Post pics???

OD is optimize for use with the mega boost on. Do not bother setting the stack with the boost off. IMO.

Bass control works fine at reducing bass on the clean channel if things are wired correctly.

Please post pics and a schematic......

[bigmik]

thanks for the replies,

here is what I found so far the prescence circuit had a 0.01 insted of the 0.1 swapped that out and now the prescence works as expected

I had a 0.022 feading the plate of v2-A changed to a 0.001 like norm suggested,going to try the 0.002 if I have one in my box,this definately helped the fartyness on the OD .also measured the trimmers and they were in the ball park that you suggested with exception of the od trimmer that was set at 30k now lowered to 20k but I might goose it up a bit

the clean channel is another story ,I had 5 uf on both bypass caps and it was way to bass heavy ,changed v1-B to 1uf and although still bass heavy tightened up the low end quite a bit.the bass control still doesn't have a lot of range IMO ,it sounds like it deepens the sound but doesn't cut the fundamental note if that makes any sense

here is the schmatic that i used also the ceria tone layout to help me with the swicthes ,I'll also post pics when my camera batteries charge

thanks again

neil

[talbany]

the clean channel is another story ,I had 5 uf on both bypass caps and it was way to bass heavy ,changed v1-B to 1uf and although still bass heavy tightened up the low end quite a bit.the bass control still doesn't have a lot of range IMO ,it sounds like it deepens the sound but doesn't cut the fundamental note if that makes any sense

Neil

You really shouldn't need a 1uf on the clean channel..IMO...Sounds like something's not wired correctly...



Tony VVT

[bigmik]

something's not wired correctly...

hey tony

aggreed ,I keep looking for something mis wired but so far no luck

[dogears]

There are other issues with the Ceriatone values, but I will not post them publically

PM me if you want help.

Scott

[talbany]

There are other issues with the Ceriatone values, but I will not post them publically

Go get em Scott!!! LOL... I love it!!

Anybody got a cigarette!!



Tony VVT

[Structo]

I have a newer version of the BM (I think).
It says v12_167

And I have this layout of the BM Funk Chassis 188.

[mcinku]

... also the ceria tone layout to help me with the swicthes
neil

You probably know this already but I will mentioned it anyway...

PAB on the Ceriatone is wired differently compared to what I can see from bluesmaster schmatic.
...but that will affect only PAB,... nothing to do with the bass part

[bigmik]

tom
thanks for the updated schematic


mcinku

how is is different? they both just break the connection from the mid pot to groung .but i could be wrong .

didn't you just finish a bluesmaster build ? how do you find the range on the bass knob ,on my non hrm when you turn the bass down you go from really thin to where you need to be but on this build you go from thick and fat to obease.

here are some pics

[mcinku]

tom
mcinku

how is is different? they both just break the connection from the mid pot to groung .but i could be wrong .

didn't you just finish a bluesmaster build ? how do you find the range on the bass knob ,on my non hrm when you turn the bass down you go from really thin to where you need to be but on this build you go from thick and fat to obease.

here are some pics

http://entertainment.webshots.com/album/572896215lvYbJr

Sorry my mistake, you're right about that. I didn't look at the schematic close enough. The only difference is the resistor value. It's 68K on Ceriatone.

You're right about that bass...
I have no issue with it on the OD side but when in clean, it's a little bass heavy. The pot it self is working for me and I also have this deep switch which helps as well.
What I would like to have... when I turn all pots at noon I should have a workable sound right there. That's something I can't do with my BM. That works with my nonHRM OTS and I like that.

Sorry, I was a little to quick to reply.