4 66-68 100w projects with marstrans

A place to discuss wiring, installation, diagrams and so on.

Re: 4 66-68 100w projects with marstrans

Postby Brian Wallace » Mon Oct 10, 2011 7:14 am

Very Nice. :wink:
Remember....You can fix it with a little extra energy and a positive attitude. ;)
User avatar
Brian Wallace
Site Admin
 
Posts: 1073
Joined: Fri Jun 06, 2008 7:34 pm
Location: Livonia, Michigan

Advertisement

Banner ads are available for $25 a month. PM or Email me at Info@wallaceamps.com for more details.

Re: 4 66-68 100w projects with marstrans

Postby Roe » Tue Oct 11, 2011 4:30 pm

thanks! I'm burning in the late 67 10000 series now. it sounds big and cleanish and very little noise, hum or ghosting. the larry grounding scheme is great. it definitely sounds similar to my early 67 100w
Roe
 
Posts: 164
Joined: Thu Jun 19, 2008 8:56 am


Re: 4 66-68 100w projects with marstrans

Postby Brian Wallace » Sun Oct 30, 2011 7:21 pm

Awesome. :)
Remember....You can fix it with a little extra energy and a positive attitude. ;)
User avatar
Brian Wallace
Site Admin
 
Posts: 1073
Joined: Fri Jun 06, 2008 7:34 pm
Location: Livonia, Michigan

Re: 4 66-68 100w projects with marstrans

Postby Roe » Mon Oct 31, 2011 4:49 pm

I experimented with voltages in the late 67 amp, since the 1203-80 has lots of primary and secondary taps. I tried everything from 495v to 445v plate voltage, prefering 465-470v since it gives a balanced tone and response that isn't too hard on the tubes. the higher voltages sound cleaner and brighter, the lower browner. late 67 schematics show 460v at the plate, something that is a little lower than most other plexi 100watters.
Roe
 
Posts: 164
Joined: Thu Jun 19, 2008 8:56 am

Re: 4 66-68 100w projects with marstrans

Postby Roe » Sun Nov 06, 2011 2:34 pm

I've found someone to solder the corners of the jtm45/100 chassises. And I've experimented with tubes in the 68 and late 67 amp. Both run RFT/Simens el34s and tungram ecc83 in v1. the 68 uses a mullard in v2, the 67 a brimar. the 68 uses a exceptionally strong mullard "RI" in v3, the 67 an old EI that has a little of the telefunken punch

I plan a real 100w shootout with some pals before Christmas. I'm gonna do real a/b tests btw the following:
- my 2008 66 45/100 and this new 66 45/100
- my 2009 67 45/100, and the new dual rectifier amp as well as the late 67 10000 series
- my 2010 69 superlead and the new 1968 superlead
Also, we'll have a 1971 superbass to compare with.
I'm especially eager to compare the 67 amps, to see how much of a difference the different power supplies makes.
Roe
 
Posts: 164
Joined: Thu Jun 19, 2008 8:56 am



Re: 4 66-68 100w projects with marstrans

Postby Roe » Fri Nov 25, 2011 6:53 pm

Roe
 
Posts: 164
Joined: Thu Jun 19, 2008 8:56 am

Re: 4 66-68 100w projects with marstrans

Postby Big Mike » Wed Dec 07, 2011 2:50 pm

Can't wait to hear about the shootout Roe.

BEen watching the FB picture updates, great work as always!
Big Mike
 
Posts: 9
Joined: Tue Jul 21, 2009 7:44 pm

Re: 4 66-68 100w projects with marstrans

Postby Roe » Mon Apr 23, 2012 6:46 am

just wanted to add that the dual rectifier amp is working well, and headcabs are on its way. Finally, the backplates should be done soon
Roe
 
Posts: 164
Joined: Thu Jun 19, 2008 8:56 am

Re: 4 66-68 100w projects with marstrans

Postby Roe » Wed May 23, 2012 6:05 am

headcabs have arrived. am only missing the backplates now
Roe
 
Posts: 164
Joined: Thu Jun 19, 2008 8:56 am

Previous

Return to Marstran Transformers

Who is online

Users browsing this forum: No registered users and 1 guest


cron