Latest posts of: MacG

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1	British Style / JCM 800 2203, 2204, 2550, 2555 / Re: 2550 Oscilation	on: September 23, 2010, 11:54:10 PM
Quote from: ToneQuest on September 23, 2010, 11:04:36 AM I'm waiting for my 2550 (fully assembled). I'll probably replace the preamp tubes with Tung-Sols, too. For my taste it's the best current production 12AX7. Probably a Sovtek LPS for V3. Have you kept the JJ power tubes? More importantly: what speaker cab and what speakers do you use? I like the TungSols, for EL34s I also like Shuguangs. I put a NOS JAN/Phillips 5751 in V2 and it tames things down nicely. This amp has tons of gain. Played through Weber Silvers & EVs. Kinda bright through the EVs. Thumps through the Silver Bells

2	British Style / JCM 800 2203, 2204, 2550, 2555 / Re: 2550 Oscilation	on: September 15, 2010, 01:48:44 AM
Thanks HH. Yes my heaters are green & most of my Gnds. Used Weber Trannies Just put in a set of TungSols and had band practice. WOW this amp sounds really good!!!! Top notch Nik

3	British Style / JCM 800 2203, 2204, 2550, 2555 / Re: 2550 Oscilation	on: September 14, 2010, 04:23:06 AM
Swaped my OT leads and that took care of my problem. Thanks Hired Hand. And Thanks Nik, GREAT STUFF

4	British Style / JCM 800 2203, 2204, 2550, 2555 / Re: 2550 Oscilation	on: September 13, 2010, 02:22:09 AM
All seems correct on the feedback circuit. All good with feedback loop unhooked. I'm thinking I need to switch the OT pin 3s also. Thanks and I'll let you know how this turns out.

5	British Style / JCM 800 2203, 2204, 2550, 2555 / 2550 Oscilation	on: September 12, 2010, 06:09:07 PM
Hi guys (first time caller long time listener) I've just finished my 2550 build and have a bug. In 50 watt mode on the normal channel i get a high pitch squeal if my presence pot is less than halfway. With the presence over half the oscillation goes away. Any tuning tips? Thanks in advance. MacG

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