JTM 45/100 Style Amp

[thousandshirts]

I just finished a DIY kind of job on a JTM 45/100. I put a build page up at:

http://www3.telus.net/public/wbrooke/45-100.htm

Lots of pictures, so beware if you're on dialup. The website isn't finished. I hope to add more pictures, more data, and sound clips.


A few pics:

http://i2.photobucket.com/albums/y21/the_boy_of_a_thousand_shirts/45-100/IMG_3352.jpg

http://i2.photobucket.com/albums/y21/the_boy_of_a_thousand_shirts/45-100/IMG_3356.jpg

http://i2.photobucket.com/albums/y21/the_boy_of_a_thousand_shirts/45-100/IMG_3357.jpg

http://i2.photobucket.com/albums/y21/the_boy_of_a_thousand_shirts/45-100/IMG_3358.jpg

http://i2.photobucket.com/albums/y21/the_boy_of_a_thousand_shirts/45-100/IMG_3359.jpg

It's a cool sounding amp. I'm mighty pleased with it.

[Regis]

Wow!! Damn nice!!!

[Enzo]

Nice work. Welcome to the place.

[thousandshirts]

Wow!! Damn nice!!!

Thanks very much! Took a bit of doing, but I managed it!

Nice work. Welcome to the place.

Thanks, Enzo, much appreciated.

[mr.jetski]

SCHWEEEET, man I just hope mine turns out half that well!

[thousandshirts]

While we're here, I'm wondering what the advantages/disadvantages of putting the two center taps of the power transformer (both HT and heaters) on the same fuse to ground. In the last photo, on the transformer, you can see I've used a green wire with a yellow stripe on it to connect two of the PT lugs together, and then to ground via the flush mount fuse mounted just below the PT in the picture. The top side is the 375-CT-375 side (blue with white stripe is the common lug), the bottom side is 3.15-CT-3.15 (heaters), and the two CT's are green w/yellow stripe. It works beautifully as is, and works beautifully with the two separated (and running the heater center tap directly to ground without fuse, but fusing the HT CT). Having the heaters fused is nice. Maybe I'd use more fuses over the years, by a small amount? I know my ass is covered so far as protecting the transformers are concerned. I can deal with the odd tube replacement. But technically speaking -- is there a best way to do this? Put that fuse someplace else entirely (there is a separate Mains fuse, the layout is near the bottom of my website)? Hmm. Thanks in advance.

[Chuck H]

Beautiful work. I love how you used a small bit of shrink tube to snug up the leads exposed from iron melt. You even matched up the lead colors. Very slick...And tedious. Nice.

Chuck

[guitician]

While we're here, I'm wondering what the advantages/disadvantages of putting the two center taps of the power transformer (both HT and heaters) on the same fuse to ground.

The heaters and the HT windings are rated at different currents, so having a fuse that protects the Heater winding probably won't protect the HT winding.