Stainless Steel Dynaco ST-70/ST-120 NEW POLISHED COVER PHOTO...

I agree Bob, there is nothing like the glow of the tubes, I needed this because of my grand kids and the fact that at this time the amp is placed very low in my system, there are times I need it on. I had the inside polished also so it gives it a fairly even distribution of light thru out, but bare is better. I am really not looking to make these up, it is a little rough around the edges and I would be concerned that with the price I would have to charge that people would not be happy with the look up close. It is a nice change up for me and my system, when I need a cover. I am happy people enjoyed the pictures.

I would like to thank Bob for his efforts on this forum, I had a blast making my amp, I never dreamed I would have a system that sounds so nice. Great product at a great price!! Thanks for answering my stupid questions in a timely fashion. GO GREEN (Michigan State)

It's alright for me if you want to look at your amps. I'm more into listening :-)

The day you want to transport it ( to impress friends; to change location; whatever) a cage
is whats between you and crushed glass.

peterh wrote:The day you want to transport it ( to impress friends; to change location; whatever) a cage
is whats between you and crushed glass.

I'm not a very bright guy, but I would suggest removing the tubes before transporting the amp. That's what I do.

Exactly what I do. Pack the tubes separately.

Maybe cross draft with 12V computer fans run on 6-8V for quietness would help tube & component life so it's even better than with the cover off.

tubes4hifi wrote:oh yes! the worlds best and finest sounding toaster! yum!

I like it!!



Which begs the question ... can you make toast with a matched set of KT-120's?

Long as I'm playing with PhotoShop ...

Was leaning in another direction here ... maybe an addon box for the front for volume and balance, maybe a VU ... and a screen for the VTA board. The tubes are right purty, but I could do without looking at that ...



Apologies to Bob for mangling his machine ... the pic was handy ...

One advantage to the addon box on the front (which I figure could use existing holes for a bracket) is it keeps all the additional signal stuff away from internal rf interference. I'd also relocate the test points to the new panel also ... whatever happens there could be easily reverted for the "classic" look.

love the toaster!

Now i remeber why i sold my Mk-III in the 80's. They hummed and it seemed impossible
to get then quiet.
The rememberence was trigged by the sound of my st-70 cover i just got from canada. It hums !
Wait, a steall cover cannot hum you say ? Yes it can. The close promixity to the mains
transformer that leaks enough to set the cover in motion :-(

( I want a stainless cover !! )

I imagine you can quiet it down quite a bit with some padding between the cover and chassis. Try some of those peel 'n stick plastic bumpers they sell at the local hardware. Just cut a notch in them for the edge of the cover to sit in so it doesn't scoot around. You should end up with a minimal gap that won't affect the look ...

Also, try temporarily adding a bit of weight on top and see if that helps. If it makes a difference, I'm sure you can come up with a permanent solution based on that.

And ya ... I'd forgotten about the toaster! Bonus points for the first one who builds it!!

sKiZo wrote:I imagine you can quiet it down quite a bit with some padding between the cover and chassis. Try some of those peel 'n stick plastic bumpers they sell at the local hardware. Just cut a notch in them for the edge of the cover to sit in so it doesn't scoot around. You should end up with a minimal gap that won't affect the look ...

Also, try temporarily adding a bit of weight on top and see if that helps. If it makes a difference, I'm sure you can come up with a permanent solution based on that.

And ya ... I'd forgotten about the toaster! Bonus points for the first one who builds it!!

Nope, it's the top area that vibrates, due to alternating magnetic field from the transformer below.

I guess that bob's transformer has a larger field then old stock dynaco.

Yes, the toaster was nice. I'd buy one if it was available. I'd give my whole supply if 7199 ( 7 new, 3 used and
two sovtek's ) for a "toaster cover".

OK ... that's why I mentioned the weight thing. If you can't stop the vibration, try damping it out?

I was reading about electronically damping an offending transformer, but the common thread there is the potential for changing the sound.

Also ... just a thought ... extra pads at the bottom of the cage could maybe raise the top enough to prevent the vibration in the first place?

Copper strap around the windings to contain the field (i.e., a Faraday Shield).