The Amp Garage

Hi Bruce - Henry Heistand owner, designer, floor sweeper, parts stocker, shipping manager, cork sniffing wanker and former builder at RedPlateAmps (found some guys who build better than I did). Retired from all things amps in '92 but this forum dragged me back in.

This model was a special build for Georgia Music Warehouse. The OD is really a D style HRM with a single tone control instead of the t,m,b trimmers. The Blackface front end does have a couple of limitations, no mode switch to change mid cap values, no mid boost on the footswitch etc. etc. I thought ...

Even if you're the best, most careful solder person you will screw up sometimes. If it happens to be on a tube socket it's much better if there is a tube installed. A plugged up socket is almost impossible to clean up for reliable use unless you have a tube installed. You can solder suck the top sid...

Interesting choice in cabinet.... Serial looks like 116 or 126 maybe.....tough to tell. Interesting that the knobs are different in the last picture, so the claim of totally mint may not be exactly true. I wonder where in MA he is? I don't want to be the one who outs the guy, I think he's totally l...

speaker looks run of the mill, has anyone ever seen a speaker like this in a real one?

My thoughts exactly. It would be nice to know what exactly is " hot hot" though, is it 110 or 150 degrees. TM Our small amps will typically measure 150 degrees Fahrenheit which is very hot to the touch, but the amp runs along happily at that temp. RE: PT amps - our small amps have 2 6L6 and 4 12AX7...

Mark wrote:I tend to use the light bulb trick, it is cheap and easy.

+1 and actually better than a variac for start up testing.

Measure the heater voltage to make sure it's not being pulled down somewhere. If it's alright, and your B+ also measures alright, It could be that it's normal - on our small amps the 6L6 tubes are right near the power transformer and the combined heat does make the chassis, transformer body and any ...

Nice - how's it sound?

For those of you that can't decide on which PI to use this may help - We did a proto of a Hi Gain single channel amp (100 watt 6L6) and gave the customer the ability to switch between the traditional D style PI (American) and the BluesMaster PI (British). The customer sent us a comparison clip that ...

tictac wrote:This is the way I do my mid-boost; you can dial in mild-boost all the way up to boogie-ville with this circuit... Only need 1/2 a relay to implement too...

TT

Genius

Here's a handy wiring guide:

re: hum - it's amazing how modern 12AX7 production tubes can vary on Hum levels, we routinely have to hand select tubes for V1 & V2 to get minimum hum.

These things can be made dead quite, even with the OD and boost dimed. I'd check the heaters first, make sure that if the transformer filament winding isn't center tapped that there are the appropriate 100R resistors to ground on either side, and that they are reasonably balanced. Otherwise it's ti...