½ power on a 50watt is a pentode/triode switch

You know what, whichever you choose, give it a month and you'll be thinking 'well I wonder what XXX would sound like coupled with YYY' And what about a 4x10? I'm still pondering what to get to replace P10R's so far I'm thinking Emi RamRods plus something else. Its a costly business but it keeps us out of trouble

That

How much of a difference do you reckon those MM's are making Doc?

Please don't pm me. The plans are above as a pdf.

No HRM has the internal OD tone stack so you shouldn't need it. There is a case for having those TMB controls on the outside but, just play your amp out of its case and tweak till you're happy then put it back.

Thanks a million Doc. New year project......

Got it working now, one of my FF extensions was preventing it. Nice tone, lovely playing. I have to say I wish mine sounded like that.

Erwin, I've never been able to get soundcloud clips to play in either FF or IE. I have just updated the Flash player from 10.0 to 10.1 and it still does nothing. Its not just your clip either, others I have tried won't play either.

Matt Schofields settings on Larry Carltons amp, November 2009

Then I'll go back to what I said earlier. Don't spend too much time analysing it now, burn it in properly before making any decisions.

How many hours do you have on it now?

Pretty much the same reaction I had when I first got mine. I have modded mine a few times (I now have a three way bright switch amongst others) and I still want to mess with the OD channel as mine is the non-hrm and the od channel is a tad too bright.

Anyway, mine improved massively with a long burn in, it is now too bright and chimey with the bright on and treble above about 6-7.

So, do the burn in.

Check your wall voltages, I sometimes feel underwhelmed by my amp, its as though it has moods and I am convinced its because of varying wall voltage, I have only recently bought a plug in meter and have seen 227-238. I didn't have the OTS fired up when it was 227 but I bet it would have had a notceable difference.

Bias, maybe go a little on the hotter side.

Too obvious I know, but guitars that sound fine through my Plexi 50 sound cack through the OTS when the strings have dulled. Change em.

OD trimmer. Play with it, it sounds like you might have it too high if your OD sounds fuzzy. It won't like pedals if you have it too high, I personally like it with just a touch of hair, more like a pushed celan channel.

PI balance. It might be your PI has drifted since Nik set it up. You need to set it with 6 volts more on pin 1 than pin 6 (double check this before doing it- search this forum I might have got it the wrong way round).

Speakers. Hmmm...... we could all spend a fortune trying different ones. I have a 4x10 closed back ported Jensen P10r's and it sounds nice and bright but these speakers are not good when loud, a bit hard on the ears. I also have a 2x12 open back with an Eminence Tonespotter and an EVM12-L and that is much better, not completely convinced by the Tonespotter and have a Red Fang waiting to go in there but I don't have much opportunity to play loud anymore so I'm in no hurry. I have also played it through  my combos speaker a G12-65 and for moderate volume this is really good.

Where do you stand? Some speakers can be very beamy and what you are hearing might not be what others are hearing. When testing make sure you move around and check this. Google 'Jay Mitchell donuts' if you want a simple solution to a beamy cab.

Valves. If you don't like what you hear now valves (and speakers) will only make a marginal difference, but it will make some.

Presence only makes a difference above 7 so thats normal.

So, if you have a Hotplate or something else you can use as aloadbox, plug a source in and let it burn in for a good while. Alternately just run it in the ON position with nothing plugged in for 3 or 4 spells of 8 hours (while you are around, not while you are out!) Don't play it in the meantime, just come back to it later and see if you can tell a diference.

If you told us the symptoms we might be better able to help.

I have 4 Jensen P10R's in a closed back cab and I really don't like them much either. And they seem to get worse the louder they get. I am planning on swapping them out for some Emi 10's when I can figure out what I want, the choice is overwhelming to be honest. I reckon Ragin Cajuns could do, but I also want to mix them up so another two of something else, maybe a little darker.

Wow that is phenomenal tone and playing. Just a shame about his singing voice