1966 JTM45 BUILD

[Marcomel79]

After a long time wanting one, im finally building me a JTM45. Im cutting the chassis and drilling all the holes myself since i had very good results doing that in a previous build.



And here is a test fit of the front panel. Like a hand in a velvet glove



Im gonna use both PT and OT from Modulus, and i bought an original Drake choke 1471-263 from a repair guy

 

[Rock city]

Keep it coming!

 

[BlueX]

Will follow!

I see that also you use high quality tools and supplies. One of my main suppliers.

 

[AndyD]

Looking good Marco! The Modulus transformers are very good IMO. Will watch with interest

 

[Tatzmann]

Looking good!

Btw, do you need a gardener?

 

[Marcomel79]

Will follow!

I see that also you use high quality tools and supplies. One of my main suppliers.

Thanks man, any chance of hearing a clip of that JTM45/100?

 

[Marcomel79]

Looking good Marco! The Modulus transformers are very good IMO. Will watch with interest

Thank you Andy, im coming with lots of questions soon

 

[Marcomel79]

Looking good!

Btw, do you need a gardener?

Hahahaha, man, you made me spray my coffee all over my bench!

 

[pietro.castelli]

I'm a simple man. I see a new build thread from Marco and I am instantly happy!
Looking forward to seeing the amp coming together!

 

[Marcomel79]

I'm a simple man. I see a new build thread from Marco and I am instantly happy!
Looking forward to seeing the amp coming together!

Pietro! Im waiting for updates on your bassman!

 

[pietro.castelli]

Pietro! Im waiting for updates on your bassman!

I'll post updates in a few days. I'm moving forward, but a very slow pace, because finding time to work on it is always a challenge.

 

[Marcomel79]

Ive got a question about the bias diode: i have an old BY100 that id like to use since im gonna use mustard caps an Piher resistors. Im gonna attach the datasheet here. @neikeel? @Pete Farrington ?

 

[BlueX]

any chance of hearing a clip of that JTM45/100?

Chassis put away temporarily, since I'm trying top get the headshell together (with near-vintage look). After that maybe.

 

[Marcomel79]

Finished the back panel earlier today...



....and marked and drilled the turret board. Enough for today, good night

 

[neikeel]

BY100 will be fine.

 

[Marcomel79]

BY100 will be fine.

Thank you Neil, i saw earlier this year you made a 1966 clone. I see that you fit an 8.2K dropping resistor and 5.6K grid stoppers. The Marstran schematic shows 10K dropping resistor and no grid stoppers.... im gonna use these KT66 with it. What do you think? Thanks in advance!

 

[pietro.castelli]

Thank you Neil, i saw earlier this year you made a 1966 clone. I see that you fit an 8.2K dropping resistor and 5.6K grid stoppers. The Marstran schematic shows 10K dropping resistor and no grid stoppers.... im gonna use these KT66 with it. What do you think? Thanks in advance!

View attachment 158151

This picture should be banned for porn!

 

[Marcomel79]

This picture should be banned for porn!

Hehe

 

[BlueX]

Finished the back panel earlier today...

View attachment 158122

....and marked and drilled the turret board. Enough for today, good night

View attachment 158137
View attachment 158124

What type of drill bit do you use? I often get chipping.

 

[Marcomel79]

What type of drill bit do you use? I often get chipping.

Bosch, 2.5mm! I start very slow and increase speed at the end. I deburr the holes with a 8mm drill bit, and i do it by hand. Just a gentle couple turns. Afterwards i enlarge the holes a bit so the turret fits snug with some good pressure....