Search found 108 matches
- Sat Apr 04, 2015 1:01 pm
- Forum: Technical Discussion
- Topic: Silvertone model 1484 reverb
- Replies: 9
- Views: 2157
Re: Silvertone model 1484 reverb
I've got a 1484 that I've had for a few years now. Head only. Mine is not pristine, and will require quite a bit to clean it up. So, I haven't tackled it, yet. I do have a 1474 that I have 'laid hands on' and it is in really good working condition, now. The reason I post this here is to show a bit o...
- Sat Feb 28, 2015 9:33 pm
- Forum: Technical Discussion
- Topic: Amp Chassis Cradle
- Replies: 35
- Views: 74717
Re: Amp Chassis Cradle
Great! I've got an account with them. I'm headed over now. Thanks.JoeCon wrote:Jack
Got mine from McMaster-Carr website. I think it's under structural framing stuff. They have short and long pieces if you have a way to cut it like a cut off saw. Also all the connectors too...
HTH...
Jack
- Sat Feb 28, 2015 5:39 pm
- Forum: Technical Discussion
- Topic: Amp Chassis Cradle
- Replies: 35
- Views: 74717
Re: Amp Chassis Cradle
Do you have a source online for this material? I like your cradle design. Restoring old amps makes for sometimes difficult ways of holding the chassis. Yours will work on any.JoeCon wrote:I built mine from 1 inch 80/20 material. Pretty flexible and stable.
Jack
- Fri Feb 27, 2015 10:32 am
- Forum: Technical Discussion
- Topic: Voltage doubler no center tap
- Replies: 34
- Views: 4937
Re: Voltage doubler no center tap
You can look at the 60's vintage Guild Thunderstar Bass or the Thunderbass schematics for a good example of what you want.
Jack
Jack
- Sun Feb 15, 2015 9:01 pm
- Forum: Technical Discussion
- Topic: variac
- Replies: 7
- Views: 1402
Re: variac
Search ebay for Staco variable transformers. I have a couple of these on hand, and used one in my breadboard build: http://ampgarage.com/forum/viewtopic.php?t=25004&highlight=breadboard The one I used in this build is rated for 3 amps. I have another 3 amp and a 5 amp. Of course, they are panel-moun...
- Sat Feb 07, 2015 9:10 pm
- Forum: Garage Talk
- Topic: Another amp find
- Replies: 8
- Views: 1632
Re: Another amp find
Do you have a lamp limiter or auto-transformer to bring it up on the first time?
Mostly, I have my hands in old amps, and occationally new builds or new amps. They all come up on a limiter, though I have brought them up on my auto-transformer.
Jack
Mostly, I have my hands in old amps, and occationally new builds or new amps. They all come up on a limiter, though I have brought them up on my auto-transformer.
Jack
- Mon Jan 12, 2015 11:16 am
- Forum: Technical Discussion
- Topic: uTracer (Micro Curve Tracer)
- Replies: 300
- Views: 84730
Re: uTracer (Micro Curve Tracer)
That is a really nice document. Well done!martin manning wrote:Posting my panel layout and description here for anyone who wants to duplicate it.
Jack
- Tue Dec 16, 2014 6:48 pm
- Forum: Technical Discussion
- Topic: Gregory Mark V tube amp
- Replies: 11
- Views: 3189
Re: Gregory Mark V tube amp
Caution well noted. I completely overlooked what may be the perfect PT for this amp. It has two Secondary 110v outputs rated for 250mA each. That takes care of the filament load and more than enough for the amp. R15 may need a different value, as the original required a rectified 117v to it. My line...
- Tue Dec 16, 2014 2:34 pm
- Forum: Technical Discussion
- Topic: Gregory Mark V tube amp
- Replies: 11
- Views: 3189
Re: Gregory Mark V tube amp
Here's an updated revision to my drawing, presented as a possible project build. Found an error on C10. I now show it as an electrolytic, where I did not before. An isolation PT has been added, and the heater loop has been separated from the now isolated AC feed. I show a dropping resistor (R16) in ...
- Sun Dec 14, 2014 1:19 pm
- Forum: Technical Discussion
- Topic: Gregory Mark V tube amp
- Replies: 11
- Views: 3189
Re: Gregory Mark V tube amp
On the 12AU6 (V1), I have R3 and R4 labeled with component values of 1Meg, each. The original schematic shows only one value between the two resistors. So, I assumed that they are both the same value. You will have to confirm that for me, when you are able to look at the layout of your amp. Also, th...
- Sun Dec 14, 2014 12:00 am
- Forum: Technical Discussion
- Topic: Gregory Mark V tube amp
- Replies: 11
- Views: 3189
Re: Gregory Mark V tube amp
I CAD'ed your drawing, so that I can now modify as I need for my radio cabinet. I may even leave it as-is (but, with isolation PT).
I've attached the CAD drawing and your original, in one PDF.
Jack
I've attached the CAD drawing and your original, in one PDF.
Jack
- Fri Dec 12, 2014 4:45 pm
- Forum: Technical Discussion
- Topic: Gregory Mark V tube amp
- Replies: 11
- Views: 3189
Re: Gregory Mark V tube amp
Glad you posted this. I'm very familiar with this basic configuration in little Harmony H-303's, Silvertones, and others. But, I'm thinking that this maybe the first time I've seen a Tremolo in one. I've been playing around with some layouts (drawings, only) of something like this to put in an old t...
- Wed Nov 05, 2014 5:24 pm
- Forum: Technical Discussion
- Topic: happy land for octals and pentodes
- Replies: 11
- Views: 1866
Re: happy land for octals and pentodes
Really good info. Have you had an opportunity to make a schematic? Please post one when you are able. Thanks.
Jack
Jack
- Sun Nov 02, 2014 11:28 am
- Forum: Technical Discussion
- Topic: Pentode Phase Driver Question
- Replies: 14
- Views: 2060
Re: Pentode Phase Driver Question
In the guitar amp genera the common thread here is Jess Oliver, principle designer at Ampeg, who later left and operated under his own name. Of course everybody used designs from the tube manuals and RDH, and once one designer found something that worked well for a given application, competitors fo...
- Sun Nov 02, 2014 11:22 am
- Forum: Technical Discussion
- Topic: Pentode Phase Driver Question
- Replies: 14
- Views: 2060
Re: Oliver Flyer
While searching for some Orange schematics I have, (somewhere amongst the GB of files) I ran across an Oliver Amplification brochure with various schematics. Unfortunately while several "G" models are listed not the "300". I just went over to UTube and the sounds of these amps are uhmm Fantastic! I...