The Amp Garage

The problem is fine machine threads,not metallurgy. Lubricant should always be used and hand tighten.10-24 would be better for people who are in a hurry. Machine threads are too exact and they have very little wiggle room. I use rivet nuts and have zero issues.Oh,and aircraft stainless fasteners do...

Thanks for the sticky, Structo! I'd like to add that I've seen quite a bit of variance in the PEMnut 'quality', in the chassis we've built... in the latest run I've been trying to dry-fit the 10-32 screw in each hole... if I feel 'stickiness' I've been running a 10-32 tap through the hole and that s...

I wasn't aware that CE was selling four preamp chassis? Tom at one time CE was selling your choice three or four preamp tube chassis. Mark On the latest build we got a few 4-preamp-hole chassis made. They are now laser-cut like the latest 3-hole ones. I have two left and a 'blemished' chassis that ...

Really sorry to hear this... my best wishes for a speed recovery!

I paired a Tonkerlite with a Red, White & Blues in a Dumble-style 2x12 to get a nice balance. You still need to back off on the presence a bit because it seems like the Tonkerlite has plenty of 'presence' built-in!

David Root wrote:mdroberts, thanx a lot for that tip about electroless tinning. Which store chains in Canada carry it?

I'm pretty sure I got it at Active Tech (http://www.active123.com) but it might've been Reset Electronics (now closed).

Tom I will check all that out Sunday thanks a lot. BobW I use house wiring too, just trying to figure out how to get a long straight section, you know looking good. :) I never did get over to the crafts store for the brass rods. Mark If you lock one end of the wire in a vise and pull other with pli...

Couldn't you get a perfectly linear sweep with your B589K pot and a 665K resistor tied across lug 3 and 1? This will give you 312K but won't mess with the tapering. Right? Mouser part#: 273-665K-RC DogEars pointed out the obvious... that the PAB relay makes the bass pot a varistor (in Rock mode, as...

I was frustrated at not being able to find / make a 312kB pot for the bass in my 183 build. I tried scraping a high-ish 250kB to get 312k but a slip of the exacto blade and I had a non-linear 1.3M ohm pot... reliability would be suspect in any case. I've seen people propose paralleling resistors wit...

Structo wrote:Schematic shows 100K on V2b should be 180K.

Good catch Tom! Comes from working with too-small printouts of the layout. I've updated the schematic posted above and included measured voltages from my build.


Thanks,

Schematic slightly updated and reposted. Thanks Stevlech!

What about the fourth preamp tube? Fx loop added after the fact, right? Tony mentioned it in the post. Sorry if I seemed like I was calling you out- that wasn't my intent. I was just looking over the pics and caught the discrepancy. Have a good day. P.S.- thanks for the schematic. One more for the ...

Can you explain...'dunk it it in tinning solution' ? How does that work? A I have a product from MG Chemicals called "Liquid Tin" I think it is generically known as Electroless Tin. You immerse cleaned PCBs or copper wire into it for about 5 minutes and then rinse and dry them off... they come out ...

stevlech wrote:Not to be a nitpicker, but has anyone else noticed #70 has 47k grid stoppers on stages 2,3, and 4?

What about the fourth preamp tube?

Definitely not the same amp as layout.

UPDATED: Thanks to Stevlech for catching a couple of errors in the schematic... I should've used a larger printout of Tony's layout! I've tried to create a schematic that checks out against Tony's layout. There was some confusion in the FET circuit as a ground connection seems to be missing between ...