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Noisy top boost module...

 
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johnmfer
RM20


Joined: 10 Aug 2006
Posts: 24

PostPosted: Wed Aug 30, 2006 11:13 am    Post subject: Noisy top boost module... Reply with quote

I'm 99% convinced this thing is defective but thought I'd check here just to be sure because I have no point of reference for Top Boost modules. I ordered it new from Music 123 and it arrived yesterday.

- The gain knob is pretty noisy, makes a muffled scratchy sound when adjusting it.

- The module itself is incredibly noisy, at a cleaner gain setting without a guitar plugged in, it's more noisy than my Brown module dialed with a fair amount of gain.

- I'm really suprised at the amount of gain this thing puts out, for being advertised as being a cleaner module I have to keep the gain around 8:00-9:00 (almost all the way down) just to get a "dirty clean" sound if that makes sense. Every AC30 I've played you have to really crank to get a crunchy tone out of.

- Finally I have to keep the treble almost all the way down to keep it from being icepick bright with my Tele. My tele is a bright guitar but is much warmer than other teles I've played. I was expecting a lot of chime/airy high end but this is really over the top.

With the exception of the first symptom, I would say it's got a bad tube, but the scratchy gain pot has me thinking something else is wrong.
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chief beef
Egnater by Rocktron TOL50 w/ Randall R212C
Randall RM50 combo with Top Boost and Brown modules
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Scott
RM100


Joined: 26 May 2006
Posts: 191
Location: Baltimore/Abingdon Maryland

PostPosted: Wed Aug 30, 2006 12:01 pm    Post subject: Reply with quote

couldn't hurt to try a quick tube swap to eliminate that as the problem
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johnmfer
RM20


Joined: 10 Aug 2006
Posts: 24

PostPosted: Thu Aug 31, 2006 7:38 pm    Post subject: Reply with quote

Scott, you're not only a fair and honest person to do business with, you're also a genius. Swapped out for a different 12AX7EH, and I'm in business - three of four taken care of. No gain pot noise, noise overall noise, no shrilly highs. The module still has a suprising amount of gain available, but I've got some 12ATs and 12AUs I might try out to cut that a bit, or I may just leave it at a low gain setting. Thanks!
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Egnater by Rocktron TOL50 w/ Randall R212C
Randall RM50 combo with Top Boost and Brown modules
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hogguitar
RM20


Joined: 03 Jul 2006
Posts: 14
Location: Seattle, WA

PostPosted: Fri Sep 01, 2006 1:13 am    Post subject: Reply with quote

Try the mod described on the grailtones site:
http://www.grailtone.com/guitar-tone-articles/randall-modules-modifications.html
It made a significant difference in the gain of my top-boost; it's now pretty clean with gain settings up to about 10 or 11 o'clock.
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johnmfer
RM20


Joined: 10 Aug 2006
Posts: 24

PostPosted: Fri Sep 01, 2006 11:06 am    Post subject: Reply with quote

Cool! Thanks for the link. I'll definitely give that a shot if the 12AU7s or 12AT7s don't do it for me.
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chief beef
Egnater by Rocktron TOL50 w/ Randall R212C
Randall RM50 combo with Top Boost and Brown modules
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Scott
RM100


Joined: 26 May 2006
Posts: 191
Location: Baltimore/Abingdon Maryland

PostPosted: Tue Sep 05, 2006 7:04 am    Post subject: Reply with quote

johnmfer wrote:
Scott, you're not only a fair and honest person to do business with, you're also a genius. Swapped out for a different 12AX7EH, and I'm in business - three of four taken care of. No gain pot noise, noise overall noise, no shrilly highs. The module still has a suprising amount of gain available, but I've got some 12ATs and 12AUs I might try out to cut that a bit, or I may just leave it at a low gain setting. Thanks!


Glad it worked out for you Smile
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