JTM 45/100 67 EL34
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- axeman
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Re: Help with my JTM100 1203-80 layout
Awesome thread, I want to build one of these too.
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Re: Help with my JTM100 1203-80 layout
Just had some time to sit down and re-think the grounding.
Can some one confirm that this is all good?
I am especially interested in weather or not i need to ground the rectifier at location 5 if i have grounded the whole mains board at location 3..?
Grounding fixed by Homebelly, on Flickr
Can some one confirm that this is all good?
I am especially interested in weather or not i need to ground the rectifier at location 5 if i have grounded the whole mains board at location 3..?
Grounding fixed by Homebelly, on Flickr
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
- neikeel
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Re: Help with my JTM100 1203-80 layout
If you are doing Larry grounding then you split the bus on the cap board to ground the rectifier and mains to point 5 and take the screens back to 4 with your bias circuit ground and the PI to 3.
Neil
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Re: Help with my JTM100 1203-80 layout
Like this....?neikeel wrote:If you are doing Larry grounding then you split the bus on the cap board to ground the rectifier and mains to point 5 and take the screens back to 4 with your bias circuit ground and the PI to 3.
Grounding fixed II by Homebelly, on Flickr
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
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Re: Help with my JTM100 1203-80 layout
Cheers Bro'.. you have been a huge help.
Next up will be sorting out a picture of how to form the caps.
I have a kinda sorta idea, but the double rectifier is confusing me a little..
Next up will be sorting out a picture of how to form the caps.
I have a kinda sorta idea, but the double rectifier is confusing me a little..
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
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Re: Help with my JTM100 1203-80 layout
Well, after moving house and city twice, seeing in the birth of my son, two redundancies and a a new job. Buying a house, moving in, cleaning it up, including tidying the garden, and getting ready for my second kid, I have finally finished building this project.
Still haven't fired it up as i need to form the capacitors in it.
But here are some pictures of the final amp.
Picture quality is a bit dark as its a wet and windy day here and the light in the kitchen was a little dark.
But any ways.. good enough for now.
DSC06198 by Homebelly, on Flickr
DSC06197 by Homebelly, on Flickr
DSC06195 by Homebelly, on Flickr
Still haven't fired it up as i need to form the capacitors in it.
But here are some pictures of the final amp.
Picture quality is a bit dark as its a wet and windy day here and the light in the kitchen was a little dark.
But any ways.. good enough for now.
DSC06198 by Homebelly, on Flickr
DSC06197 by Homebelly, on Flickr
DSC06195 by Homebelly, on Flickr
Last edited by Homebelly on Sat Jan 04, 2014 5:13 pm, edited 1 time in total.
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
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Re: Help with my JTM100 1203-80 layout
DSC06194 by Homebelly, on Flickr
DSC06193 by Homebelly, on Flickr
DSC06192 by Homebelly, on Flickr
DSC06188 by Homebelly, on Flickr
DSC06187 by Homebelly, on Flickr
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
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Re: Help with my JTM100 1203-80 layout
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
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Re: JTM 45/100 67 EL34
Nicely done! Where did those caps come from on the power board?
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Re: JTM 45/100 67 EL34
looks very nice! I'm very happy with my aluminium chassis dual rectifier amp. the ghosting is not too bad, and the response is very dynamic. Its a great amp for hendrix, kossoff, clapton and EJ
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
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
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Re: JTM 45/100 67 EL34
Hi Roe... I am getting ready to post a couple of questions about forming the caps.
I am wondering if i will need two 100K resistors, one for each rectifier, or just one across the first rectifier and cap?
I'm also not sure if the 1203-80 has a dedicated CT?
I am wondering if i will need two 100K resistors, one for each rectifier, or just one across the first rectifier and cap?
I'm also not sure if the 1203-80 has a dedicated CT?
Some of my toonz. http://soundcloud.com/sets" onclick="window.open(this.href);return false;
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
My stuff; two strats, one with Van Zants, the other with Fralins. A Jazz bass. One PRS McCathy gold top.
- Xplorer
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Re: JTM 45/100 67 EL34
Very cool ! Beautiful build !! Congrats on managing to build this one while you had so much to do in your life.
Looking forward to hear some clips now !
What power transformer are these ? i Wonder if i could use a 45/100 1204-43 power transformer, and i guess ... a black flag output transformer...
if a 45/100 OT can't work there.
What choke is it ?
Looking forward to hear some clips now !
What power transformer are these ? i Wonder if i could use a 45/100 1204-43 power transformer, and i guess ... a black flag output transformer...
if a 45/100 OT can't work there.
What choke is it ?
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Re: JTM 45/100 67 EL34
it's easier to form the caps before they are installedHomebelly wrote:Hi Roe... I am getting ready to post a couple of questions about forming the caps.
I am wondering if i will need two 100K resistors, one for each rectifier, or just one across the first rectifier and cap?
I'm also not sure if the 1203-80 has a dedicated CT?
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
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
- Strat78
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Re: JTM 45/100 67 EL34
I'm thinking along these lines too these days. With the tubes pulled you are exposing allot of the little pre-amp caps to voltages above their ratings if you do not use a variac when forming. Still it would be cool to know just how you would go about this with the dual rectifier.Roe wrote:it's easier to form the caps before they are installedHomebelly wrote:Hi Roe... I am getting ready to post a couple of questions about forming the caps.
I am wondering if i will need two 100K resistors, one for each rectifier, or just one across the first rectifier and cap?
I'm also not sure if the 1203-80 has a dedicated CT?