JTM45 RI conversion

jelle · Post by **jelle** » Wed Apr 24, 2013 1:18 pm

I was actually quite surprised with the dynamic range of this amp, it was great. I want one for myself. Question: who sells a correct alu JTM45 chassis?

v846 · Post by **v846** » Wed Apr 24, 2013 1:33 pm

Metro or Marstran might have em..

What kinda chassis ya want flanged, offset or block ?

David

ToneMerc · Post by **ToneMerc** » Wed Apr 24, 2013 3:46 pm

jelle wrote:I was actually quite surprised with the dynamic range of this amp, it was great. I want one for myself. Question: who sells a correct alu JTM45 chassis?

http://valvestorm.com/JTM45%20Kit

TM

jelle · Post by **jelle** » Wed Apr 24, 2013 5:24 pm

Valvestorm looks good, even face panels now. Thanks for the replies!

Blackburn · Post by **Blackburn** » Wed Apr 24, 2013 5:28 pm

oh7hhi wrote:
Blackburn wrote:
To hell with headroom!!!

Can I use this as a signature?

Of course.

PaisleyTube · Post by **PaisleyTube** » Fri May 03, 2013 9:41 pm

What's the B+?

Most reïssues I've seen were way below 400 Volts while a couple of real/old JTM45s were around 450 Volts....

Reeltarded · Post by **Reeltarded** » Fri May 03, 2013 9:42 pm

Mine is 452 with a tube.

PaisleyTube · Post by **PaisleyTube** » Fri May 03, 2013 9:45 pm

Reeltarded wrote:Mine is 452 with a tube.

reï or other?

jelle · Post by **jelle** » Sat May 04, 2013 12:01 am

PaisleyTube wrote:What's the B+?

Most reïssues I've seen were way below 400 Volts while a couple of real/old JTM45s were around 450 Volts....

Hi Chris! How are you?!

See my first post.

Reeltarded · Post by **Reeltarded** » Sat May 04, 2013 12:06 am

'86 BB reissue here.

Jelle said 395v his.

groovtubin · Post by **groovtubin** » Sat May 04, 2013 1:28 am

Love these amps!

jim@Omegaamps

Reeltarded · Post by **Reeltarded** » Sat May 04, 2013 3:57 am

Nice one! love that!

groovtubin · Post by **groovtubin** » Sat May 04, 2013 4:04 am

Reeltarded wrote:Nice one! love that!

Thanks man!

built that in roughly 4 days i`m getting a tad slower as i get older! lol!
jim

Roe · Post by **Roe** » Sat May 04, 2013 9:12 am

PaisleyTube wrote:What's the B+?

Most reïssues I've seen were way below 400 Volts while a couple of real/old JTM45s were around 450 Volts....

yes, original voltage charts show 440 and 450v. I looked at one original recently that had ca 450v, depending on bias. most originals used the 1k flying resistor, but the RI omitted it, leading to screen voltage exceeding plate voltage

PaisleyTube · Post by **PaisleyTube** » Sat May 04, 2013 9:46 am

Roe wrote:
PaisleyTube wrote:What's the B+?

Most reïssues I've seen were way below 400 Volts while a couple of real/old JTM45s were around 450 Volts....
yes, original voltage charts show 440 and 450v. I looked at one original recently that had ca 450v, depending on bias. most originals used the 1k flying resistor, but the RI omitted it, leading to screen voltage exceeding plate voltage

+1
+ different filtering

Is the choke right after the ot-centre-tap or in front? did forget to check that and/but the old schematics are pretty unclear to me regarding that.....

tia!

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JTM45 RI conversion

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