I'm slowly evolving my JTM45 kit into something else. Just not a fan of several thins in that circuit.
Iv'e now got it mostly set to lead specs, split cathode, .0068 V1B, EL34's,. yadda yadda.
So I'm thinking maybe I should swap out the OT for something more in line with what it's morphing to?
So all things being considered, in a Stock metro PT'd amp with the above changes, what's the difference between a 79-128 and a 79-139 OT's going to be?
Also should I be looking at a different choke?
Thanks
Mike
Difference in tone between JTM50 and JMP50 OT's?
Moderator: VelvetGeorge
- Big Mike
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Difference in tone between JTM50 and JMP50 OT's?
Metroamp kit JMP50 - CM OT
Metroamp JTM45 turned JMP50 w/Classictone OT
Marshall 2550 Jubilee
Powered by Thorn and Kauer guitars
Scumback Speakers
Metroamp JTM45 turned JMP50 w/Classictone OT
Marshall 2550 Jubilee
Powered by Thorn and Kauer guitars
Scumback Speakers
-
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Re: Difference in tone between JTM50 and JMP50 OT's?
The 784-128 has a 3.5K primary, like the 139', but also has a buried 100V tap which apparently does affect the tone.
Here's Marstran's 128 OT. Two in stock!
http://www.marstran.com/50W%20OT%20128.htm" onclick="window.open(this.href);return false;
Here's Marstran's 128 OT. Two in stock!
http://www.marstran.com/50W%20OT%20128.htm" onclick="window.open(this.href);return false;
"I don't like country music, but I don't mean to denigrate those who do. And for the people who like country music, denigrate means 'put down' " - Bob Newhart
- Big Mike
- Senior Member
- Posts: 796
- Joined: Tue Oct 31, 2006 12:42 am
- Just the numbers in order: 7
- Location: East Bay California - Raider Nation
Re: Difference in tone between JTM50 and JMP50 OT's?
Yeah but what's the sound difference?
Metroamp kit JMP50 - CM OT
Metroamp JTM45 turned JMP50 w/Classictone OT
Marshall 2550 Jubilee
Powered by Thorn and Kauer guitars
Scumback Speakers
Metroamp JTM45 turned JMP50 w/Classictone OT
Marshall 2550 Jubilee
Powered by Thorn and Kauer guitars
Scumback Speakers
- Big Mike
- Senior Member
- Posts: 796
- Joined: Tue Oct 31, 2006 12:42 am
- Just the numbers in order: 7
- Location: East Bay California - Raider Nation
Re: Difference in tone between JTM50 and JMP50 OT's?
Duh of course I meant 784-128 and 784-139
Brain fade...
Brain fade...
Metroamp kit JMP50 - CM OT
Metroamp JTM45 turned JMP50 w/Classictone OT
Marshall 2550 Jubilee
Powered by Thorn and Kauer guitars
Scumback Speakers
Metroamp JTM45 turned JMP50 w/Classictone OT
Marshall 2550 Jubilee
Powered by Thorn and Kauer guitars
Scumback Speakers