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1  British Style / JTM 45, 50 / Re: Help installing choke and OT on: May 27, 2014, 09:58:07 AM
Thanks for the response. In the end that is exactly what I did. I went to my hardware store and found a shorter M5 screw, a couple of lock washers and matching non-locking nut. It was fiddley fishing the screw in and took a while to get it to fall through. Once it was in place, I gently started the nut. As soon as the nut contacted the bracket the lock washer started to bite and all was well.

2  British Style / JTM 45, 50 / Re: 12AT7 in Phase Inverter on: May 27, 2014, 09:52:49 AM
That makes a lot of sense.

I had checked the spec sheets but my eyes glazed over a bit. I just used my ears and found what I was looking for.

3  British Style / JTM 45, 50 / smooth trebles on: May 26, 2014, 08:37:20 PM
With some guitars, I found a bit of harshness or brittle trebles. Replaced the disk ceramic cap on high treble volume pot with the same value (100pf) in silver mica. Noticeably smoother.

That is all.
4  British Style / JTM 45, 50 / 12AT7 in Phase Inverter on: May 26, 2014, 03:54:30 PM
Finished up by adding transformers, tubes and a box to Nik's built chassis. Amp sounds quite nice, except it starts breaking up a bit too early for me.

My band is fairly loud and I like to set my amp so it is sorta semi-clean. I like a little Marshall crunch and get into mild distortion when I dig in. More than that and I will use a pedal. I do this for versatility so I can go from cleanish, to dirty to filthy easily in a live situation.

All my voltages were fine, so I did a bit of experimenting with preamp tubes as I have boxes of them.

When I put a 12AT7 (equivalent to ECC81) in the P.I. the amp seemed to come alive. Much less compressed, much cleaner and more powerful sounding. Luckily I had an RCA blackplate pull in my box and I think it will live in V3 of my JTM45 until it dies.

Anyway, anybody looking for more clean headroom, try lower gain tubes in the PI, apparently a lot of distortion and compression is coming from that stage. Low gain 12AX7s are available, as well as tubes such as 12AT7 or 5751 Just might be just the ticket.P.
5  British Style / JTM 45, 50 / Help installing choke and OT on: May 20, 2014, 03:38:53 AM
I acquired a set of transformers and had Nik build me a fully assembled chassis, minus transformer and choke.

Now I can't figure out how to install the choke and 1 screw on the OT without pulling the turret board and messing up the perfect lead dress.

I can probably get the screws in with wire and fiddling, but if I do, how do you keep them from spinning as you tighten the locking castle nut?

Any help would be appreciated here!!

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