Search found 1814 matches

by heisthl
Thu Jul 24, 2014 9:31 pm
Forum: Dumble Discussion
Topic: Who is who?
Replies: 31
Views: 4844

Re: Who is who?

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. :D
by heisthl
Sun Sep 29, 2013 8:12 pm
Forum: Garage Talk
Topic: NADs
Replies: 53
Views: 8537

Texas Slinger

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 ...
by heisthl
Wed Mar 27, 2013 3:20 am
Forum: Dumble Discussion
Topic: Which one first?
Replies: 34
Views: 4162

RE: Dummy Tubes

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...
by heisthl
Mon Jan 28, 2013 5:55 am
Forum: Dumble Discussion
Topic: Dumble on TGP - this is a weird one
Replies: 32
Views: 8088

Re: Dumble on TGP - this is a weird one

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...
by heisthl
Mon Jan 28, 2013 5:45 am
Forum: Dumble Discussion
Topic: Dumble on TGP - this is a weird one
Replies: 32
Views: 8088

Re: Dumble on TGP - this is a weird one

speaker looks run of the mill, has anyone ever seen a speaker like this in a real one?
by heisthl
Fri Jan 25, 2013 5:41 pm
Forum: Dumble Discussion
Topic: Hot PT
Replies: 18
Views: 2318

Re: Hot PT

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...
by heisthl
Thu Jan 24, 2013 8:07 pm
Forum: Dumble Discussion
Topic: Manzamp!
Replies: 462
Views: 80050

Re: Manzamp!

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.
by heisthl
Thu Jan 24, 2013 8:03 pm
Forum: Dumble Discussion
Topic: Hot PT
Replies: 18
Views: 2318

Re: Hot PT

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 ...
by heisthl
Tue Jan 08, 2013 5:41 pm
Forum: Dumble Discussion
Topic: One tube verb - rack version
Replies: 24
Views: 3409

Re: One tube verb - rack version

Nice - how's it sound?
by heisthl
Sun Nov 25, 2012 4:50 am
Forum: Dumble Discussion
Topic: American or British PI
Replies: 6
Views: 1159

American or British PI

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 ...
by heisthl
Thu Oct 11, 2012 3:08 am
Forum: Dumble Discussion
Topic: Fuchs casinoline boost... Not PAB?
Replies: 7
Views: 1454

Re: Fuchs casinoline boost... Not PAB?

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 :idea:
by heisthl
Wed Oct 03, 2012 12:01 am
Forum: Dumble Discussion
Topic: New HRM build
Replies: 251
Views: 50132

Re: New HRM build

Here's a handy wiring guide:
by heisthl
Tue Aug 28, 2012 9:27 pm
Forum: Dumble Discussion
Topic: Noise levels in Dumble amps?
Replies: 29
Views: 4125

Re: Noise levels in Dumble amps?

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.
by heisthl
Tue Aug 28, 2012 8:35 pm
Forum: Dumble Discussion
Topic: Noise levels in Dumble amps?
Replies: 29
Views: 4125

Re: Noise levels in Dumble amps?

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...