My 50W DIY Build 2204!
- landers5150
- Senior Member
- Posts: 58
- Joined: Mon Jan 24, 2011 12:29 pm
- Just the numbers in order: 7
My 50W DIY Build 2204!
Hi Folks,
I'm gonne be documenting the build on my blog (http://liam2204build.wordpress.com/) for those who are interested!
Thanks!
I'm gonne be documenting the build on my blog (http://liam2204build.wordpress.com/) for those who are interested!
Thanks!
-
- Senior Member
- Posts: 413
- Joined: Tue Oct 16, 2012 10:33 am
- Just the numbers in order: 13492
- Location: Israel. Bat-Yam
Re: My 50W DIY Build 2204!
There are 2 video clips of 2204 on your link, but these amps are not the same. JMP 2204 and JCM 800 2204 are different.
JMP has less gain on a high channel (3 gain stages) and the low channel is more usable. JCM 800 has 4 gain stages on a high channel, and the low channel is just for an option. I use it with Maxon AD-80 (the old one), and heavy modified BOSS CE-2 chorus, and the result is outstanding! But it's not so good on it's own.
JMP has less gain on a high channel (3 gain stages) and the low channel is more usable. JCM 800 has 4 gain stages on a high channel, and the low channel is just for an option. I use it with Maxon AD-80 (the old one), and heavy modified BOSS CE-2 chorus, and the result is outstanding! But it's not so good on it's own.
- axeman
- Senior Member
- Posts: 2464
- Joined: Wed Apr 02, 2008 1:21 pm
- Just the numbers in order: 7
- Location: Los Angeles
- Contact:
Re: My 50W DIY Build 2204!
Why are you using Metal Film Resistors?
-
- Senior Member
- Posts: 413
- Joined: Tue Oct 16, 2012 10:33 am
- Just the numbers in order: 13492
- Location: Israel. Bat-Yam
Re: My 50W DIY Build 2204!
You talking about me?
- neikeel
- Senior Member
- Posts: 7231
- Joined: Tue Dec 06, 2005 8:31 am
- Location: Suffolk, England
Re: My 50W DIY Build 2204!
I am puzzled.Haze13 wrote:There are 2 video clips of 2204 on your link, but these amps are not the same. JMP 2204 and JCM 800 2204 are different.
JMP has less gain on a high channel (3 gain stages) and the low channel is more usable. JCM 800 has 4 gain stages on a high channel, and the low channel is just for an option. I use it with Maxon AD-80 (the old one), and heavy modified BOSS CE-2 chorus, and the result is outstanding! But it's not so good on it's own.
Apart from some early oddball JMP50 2204s from 76/77 which had a non-cascaded front end the JMP 2204 and JCM800 have exactly the same number of preamp tubes in the same configuration with the same number of gain stages with V1b (0.68/2k7 cathode cascaded into V1a 10k via 22nf couplers a 470pF/470K and then to V2a. These then feed in to the cathode follower tone stack on V2b with V3 being the PI.
Where did you find the 4 stager
Neil
-
- Senior Member
- Posts: 413
- Joined: Tue Oct 16, 2012 10:33 am
- Just the numbers in order: 13492
- Location: Israel. Bat-Yam
Re: My 50W DIY Build 2204!
I was talking about JMP 50 from 77... And about JCM 800 I always forget that cathode follower doesn't count as a gain stage. Sorry about that!
It's only my first year in the Faculty of Engineering, and the only thing that we learning is a math and the physics! Damn!
It's only my first year in the Faculty of Engineering, and the only thing that we learning is a math and the physics! Damn!
- neikeel
- Senior Member
- Posts: 7231
- Joined: Tue Dec 06, 2005 8:31 am
- Location: Suffolk, England
Re: My 50W DIY Build 2204!
Keep going with the maths and physics too they will be very important later!Haze13 wrote:I was talking about JMP 50 from 77... And about JCM 800 I always forget that cathode follower doesn't count as a gain stage. Sorry about that!
It's only my first year in the Faculty of Engineering, and the only thing that we learning is a math and the physics! Damn!
Neil
-
- Senior Member
- Posts: 413
- Joined: Tue Oct 16, 2012 10:33 am
- Just the numbers in order: 13492
- Location: Israel. Bat-Yam
- landers5150
- Senior Member
- Posts: 58
- Joined: Mon Jan 24, 2011 12:29 pm
- Just the numbers in order: 7
Re: My 50W DIY Build 2204!
Okay,Haze13 wrote:There are 2 video clips of 2204 on your link, but these amps are not the same. JMP 2204 and JCM 800 2204 are different.
JMP has less gain on a high channel (3 gain stages) and the low channel is more usable. JCM 800 has 4 gain stages on a high channel, and the low channel is just for an option. I use it with Maxon AD-80 (the old one), and heavy modified BOSS CE-2 chorus, and the result is outstanding! But it's not so good on it's own.
1) There is only one 2204 video on the blog. The first video is a Suhr SL68, so a plexi style amp. Second one is the 77JMP
2) Marshall JMP 2204 and JCM800 2204 are the same amps, circuit wise. Just a different head box
- landers5150
- Senior Member
- Posts: 58
- Joined: Mon Jan 24, 2011 12:29 pm
- Just the numbers in order: 7
Re: My 50W DIY Build 2204!
The only metal films I am using is are the 1 ohm 1% bias resitors of the power tubes. Other than that its is carbon films and metal oxides as per the metro 50w BOM.axeman wrote:Why are you using Metal Film Resistors?
The green ones are metal oxides, the majority will be carbon film but i didnt post any pictures of those.