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Author Topic: Trebble problem bluesmaster od channel  (Read 16301 times)
dr6
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« Reply #15 on: March 11, 2011, 05:11:46 PM »

I am also a new bluesmaster owner with a fizzy gain channel.  I think I will go through and check component values also.  Can anyone tell me which resistor is the slope resistor is?  I feel a little silly asking, but I am not an electronics whiz.  Also, I am assuming that there is no way to measure actual values of the components without removing them from the board?
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plasticvonaband
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« Reply #16 on: March 11, 2011, 09:38:04 PM »

Mine was a lil fizzy the first few days. Let it burn in before you change anything. The CD player/MP3 player is a great method. Just be sure the volume is turned down a bit due to the impedance difference
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dr6
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« Reply #17 on: March 11, 2011, 11:56:17 PM »

I suppose I should have stated my question a little bit more clearly.  I am new to the bluesmaster, but it is not a new amp.  I bought it used, it should be plenty broken in by now.

I am going to give the components a look over even if I do not change anything . . . just like to know what I have in there.  Slope resistor anyone?
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T Wilcox
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« Reply #18 on: March 12, 2011, 12:36:07 AM »

OD TRIM?
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plasticvonaband
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« Reply #19 on: March 12, 2011, 05:08:18 AM »

i've attached a pic of the slop resistor for you, but i have a few suggestions/questions

First of all as T Wilcox suggested, you may want to experiment with the OD trim. By adjusting it you can go from slight overdrive to all out chaos, but it starts to get fizzy as you turn it up.
What kind of preamp/power tubes are you running? Different tubes can yield different results

What kind of speakers are you running? The OTS series is kinda picky when it comes to speakers.

Are you running OD and PAB at the same time? If you aren't you may want to try it. Without the PAB on (which in my opinion should be renamed Tone Stack Lift, since that is what it does) in OD mode on an HRM amp you are sending you signal through two tone stacks which can make your town sound either muddy or harsh depending on your settings.

Also, the Preamp (clean) volume will effect the overall gain as well, as V1 cascades into V2. In otherwords if you crank the clean gain and use your guitar volume to get some nice dirt when pushed, when you kick in the OD channel your OD can be very gainy and fizzy as well.

A C-Lator helps alot, but isn't technically necessary although, mine really woke up and sounded awesome with it

As far as the slope resistor goes, the common mod is to switch it to 68k or 100k and to switch the main tonestack bass pot from 500k to 250k, and i even considered doing it until the amp got nicely broken in, got some great speakers, played around with different tubes, and adjusted the OD tonestack with the PAB engaged, adjusted the OD trim, and got a c-lator.

Hope this helps, and let us know the answers to the questions if ya can; AND above all, remember all that matters is that you find YOUR tone and YOU like the way your amp sounds

Gregg


* resist.JPG (71.39 KB, 887x563 - viewed 743 times.)
« Last Edit: March 12, 2011, 05:12:31 AM by plasticvonaband » Logged

Overdrive is like peanut butter. Some like it crunchy, some like it creamy.
Bluesmaster 50 2x12 combo and some guitars.
dr6
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« Reply #20 on: March 13, 2011, 10:12:48 PM »

Thanks for the detailed reply and the pic - awesome helpful

author=plasticvonaband link=topic=1541.msg16592#msg16592 date=1299906498
i've attached a pic of the slop resistor for you, but i have a few suggestions/questions


First of all as T Wilcox suggested, you may want to experiment with the OD trim. By adjusting it you can go from slight overdrive to all out chaos, but it starts to get fizzy as you turn it up.
What kind of preamp/power tubes are you running? Different tubes can yield different results


Experimenting with the OD trim sounds like a good idea.
I am currently running  these tubes:
v1 = RCA black plate 5751     
v2 = Brimar 12AT7WA / CV4024
v3 = GT SAG-AX7-MPI-1104092   
output = TAD 6L6WGC-STR
but I have some more 12ax7's on the way on the way that I want to try out in v1 & v2.

What kind of speakers are you running? The OTS series is kinda picky when it comes to speakers.

I've got a Celestion gold and a Electrovoice EVM-12S in a pair of thiele-style cabs.  Also tried a Celestion G12T-75.  The gold and evm12s are both fairly bright sounding.  I am happy with them, but I wouldn't mind hearing other speaker suggestions though if there is something particularly well suited to the OTS.

Are you running OD and PAB at the same time? If you aren't you may want to try it. Without the PAB on (which in my opinion should be renamed Tone Stack Lift, since that is what it does) in OD mode on an HRM amp you are sending you signal through two tone stacks which can make your town sound either muddy or harsh depending on your settings.

I have tried it this way, but I find the voicing between clean/od channels is too different, with the od channel being much duller/darker.  The previous owner disconnected the OD channel tone trim pots and replaced them with a cap.  I think I should try the amp with this mod reversed to see if it helps.


Also, the Preamp (clean) volume will effect the overall gain as well, as V1 cascades into V2. In otherwords if you crank the clean gain and use your guitar volume to get some nice dirt when pushed, when you kick in the OD channel your OD can be very gainy and fizzy as well.

I typically have the preamp volume at noon (5)

A C-Lator helps alot, but isn't technically necessary although, mine really woke up and sounded awesome with it

I ordered a C-lator, but it is taking a really long time to arrive.  I am really quite curious to see how the amp responds with it.


As far as the slope resistor goes, the common mod is to switch it to 68k or 100k and to switch the main tonestack bass pot from 500k to 250k, and i even considered doing it until the amp got nicely broken in, got some great speakers, played around with different tubes, and adjusted the OD tonestack with the PAB engaged, adjusted the OD trim, and got a c-lator.

I will give the 68k/100k a try.  What effect does 250k bass pot have? Less bass output?

Hope this helps, and let us know the answers to the questions if ya can; AND above all, remember all that matters is that you find YOUR tone and YOU like the way your amp sounds

Gregg


Again, a very helpful reply, thank you.
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T Wilcox
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« Reply #21 on: March 13, 2011, 10:30:13 PM »

I keep playing with the OD trim and Im gettin close to where I want to keep it then the PAB on OD sounds fizzy, I have nothing in my loop right now and am waiting for a K-lator to come in mail. Dont know if it will help too much but atleast let me add the effects I like Huh?
I first tried my amp on my JSX amp speakers and it sounded awesome!
I have since built a 1x12 combo out of a old Peavey bass speaker cab ( will show pics later, but this is hopefully only temporary )
Got a WGS ET-65 and it sounded horrible all day yesterday.
It is just now starting to lose that brand new speaker harshness, ( atleast 10 hrs burnin so far )
It still doesnt sound as good as the JSX speakers which only really sounded good because they were broken in
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rane008
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« Reply #22 on: March 15, 2011, 11:03:21 PM »

Hey T,

Felt the same way when I first got my BM100. That was about a year ago.  I think for me, the real help came from letting everything burn in.  I am sure this is posted above, so let this last comment just count as a +1 for me.

Another thing I did that greatly improved the OD was to drop an RCA 12ax7 in the V2.  Got an (Almost)NOS from Mike at kcanostubes.com.  Great guy to work with and at $50, hard to beat let me tell you. 

My 2 cents.

St. Ephen
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T Wilcox
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« Reply #23 on: March 15, 2011, 11:31:09 PM »

yeah its starting to sound better already I think they call that dog ears or somethin Smiley
 heres a crappy pic of my crappy TEMPORARY cab


* photo.JPG (289.08 KB, 1280x960 - viewed 670 times.)
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Plexi bass 1986 ( build #6 )
Ceriatone Ultra Champ ( build #5 )
TW Express clone ( build #4 )
Ceriatone HRM MK2 ( build #3 )
Ceriatone 2550  ( Build #2 )
Ceriatone OTS FM50 Modern Eagle Mod (Build #1)
EBMM Steve Morse original
50th anniv American Strat
T Wilcox
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« Reply #24 on: March 15, 2011, 11:33:48 PM »

its actually vertical though in real life Grin
stupid iphone
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Plexi bass 1986 ( build #6 )
Ceriatone Ultra Champ ( build #5 )
TW Express clone ( build #4 )
Ceriatone HRM MK2 ( build #3 )
Ceriatone 2550  ( Build #2 )
Ceriatone OTS FM50 Modern Eagle Mod (Build #1)
EBMM Steve Morse original
50th anniv American Strat
SoundPerf
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« Reply #25 on: March 16, 2011, 02:42:29 AM »

heres a crappy pic of my crappy TEMPORARY cab
Don't feel bad, I;m having to play through a Vintage 30 sitting in a Line 6 SpiderValve 112.

BTW, check my other thread.
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Chris

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