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Discussion in 'Shock Brother's DIY Amps' started by RollingBender, Feb 5, 2019.
Warm glow on a very cold night.
At idle, this amp is dead quiet.
Finally got a chance to really run this thing through the paces. I used it Sunday at band rehearsal and was really able to let loose with it a few times since. I absolutely love the normal channel, both clean and wound out. The TMB channel is not getting my love... the lows are farty and it does not have much brilliance either. I ordered all new components for the front panel, maybe that will help. The pots in the recycled chassis don’t seem very healthy.
Wow, you brought an AK-47 to a knife fight!
So, I see grid resistors on some variants of the 18 watt TMB and not on others? Is this contributing to the "darkness" of this amp?
Depends on their value and I can read almost nothing in the image.
Post a high res version and I'm willing to do some calculations/simulations.
I believe there both 10K
They are 10K. I took them out last night so test the difference. I "think" it is a little brighter and I "think" it is a bit noisier without them...hard to tell not being able to A/B them on the fly.
I've never played through any 18watt variant before so have no frame of reference but a lot of people say that it can sometimes get too ice-pick-esqe, especially with single coils. I've been playing a Strat and Tele through it. On the bridge pickup, it's OK but not as bright as I want. With any other pickup combination, it’s VERY dark sounding and the bass is flabby.
Yeah 10K and people laughed at my clear back panel....... who’s laughing now
Interesting to see where this goes. I've never cranked mine up all the way. I always seem to be plugged in channel 2. I'm going to Crank it up monday neighbors are gone
I mostly use the TMB channel 2 as well.
Blencowe says 10k is the minimum input resistance that consumer audio gear expect to see. So I guess you should not remove it from the TMB input.
The high input on the other channel has a cutoff frequency of 20.4kHz with and 23.4kHz without the 10k grid stoppers.
I believe the low input will have an even higher cutoff frequency.
However... the 470k grid stopper of the second stage of the TMB gives a cutoff frequency of 3.4kHz.