70/71 Spec 1987.

Get support and show off your MetroAmp 50 Watt kit builds.

Moderator: VelvetGeorge

User avatar
Senior Member
Posts: 7151
Joined: Tue Dec 06, 2005 8:31 am
Location: Suffolk, England

Re: 70/71 Spec 1987.

Post by neikeel » Mon Apr 15, 2019 8:27 am

axeman wrote:
Mon Apr 15, 2019 1:50 am
Send me the inspection tag so I can initial it.
I have some!

User avatar
Senior Member
Posts: 86
Joined: Sat Sep 13, 2008 8:29 am

Re: 70/71 Spec 1987.

Post by Danhalen » Thu May 09, 2019 3:05 pm

Wow nice work! Beautiful build!

Senior Member
Posts: 5035
Joined: Thu Apr 13, 2006 1:36 pm
Just the numbers in order: 7
Location: Drontheim. Norwegen

Re: 70/71 Spec 1987.

Post by Roe » Fri May 10, 2019 3:06 am

very nice but 2k2 screen resistors is overkill with 460v. 1k should work. and 10k + 8.2k droppers is a little high with 460v on the plates. 8.2+8.2k is more than sufficient. 8.2+6.8k is better perhaps
http://www.myspace.com/20bonesband" onclick="window.open(this.href);return false;
http://www.myspace.com/prostitutes" onclick="window.open(this.href);return false;
Super 100 amps: 1202-119 & 1202-84
JTM45 RS OT JTM50 JMP50 1959/2203/34/39

Senior Member
Posts: 435
Joined: Thu Jul 28, 2011 1:37 am
Just the numbers in order: 7

Re: 70/71 Spec 1987.

Post by revolver1 » Sun May 19, 2019 4:03 am

Thanks for the response Roe.

Am I right in thinking the 2.2k screen resistors will add a bit of squish at high volume? Will there be any other effect on the sound?

I think your right about the droppers, I'm going to try taking it down to two 8.2k. I thought it was quite aggressive when I tested it, in a really good way there's a lot to like about it but its not exactly what I was shooting for ie, West Coast mod.

I changed the 4700pf bright cap for a 100pf but I suspect it may not be the culprit.

Post Reply