Search found 115 matches
- Fri Mar 13, 2015 7:02 pm
- Forum: Technical Discussion
- Topic: Thoughts on cathode current sensors
- Replies: 20
- Views: 3088
Re: Thoughts on cathode current sensors
I have some Littelfuse 2AG (5x15mm) axial through-hole fuses I was intending to place in series with each leg in the rectifier chain. They should never blow in normal operation. If they do the amp would require servicing. Of course, without them it would require servicing also, only for more $$ if a...
- Tue Mar 03, 2015 1:38 am
- Forum: Dumble Files
- Topic: 3rd Generation Period Correct ODS 50W
- Replies: 41
- Views: 52294
Re: 3rd Generation Period Correct ODS 50W
I am now starting to attach wires to the assembled boards based on this layout and this schematic (both in this thread). I sort of expect that the layout is correct. That said. the schematic appears to have some small errors. The two tube sections are reversed for V1 and V2. Maybe this doesn't matte...
- Fri Feb 27, 2015 2:34 am
- Forum: Technical Discussion
- Topic: Edcor service
- Replies: 24
- Views: 4455
Re: Edcor service
I have bought four with no issues. I would pay more if they were physically more rugged and would prefer them to be so.
- Wed Feb 25, 2015 1:17 am
- Forum: Dumble Discussion
- Topic: New Build D-lite 22.... where to source chassis and boards?
- Replies: 6
- Views: 1730
Re: New Build D-lite 22.... where to source chassis and boards?
I see the Brown Note amps website has been updated 2015 and includes a lot of new amps/options I have not seen before but the forum is down. So that must mean these guys are getting their kits or able to order them? A month ago or so I inquired and had some email back-and-forth about a chassis and ...
- Tue Feb 24, 2015 5:26 pm
- Forum: Dumble Discussion
- Topic: 3rd Gen w/PAB
- Replies: 6
- Views: 1796
Re: 3rd Gen w/PAB
I just did something similar with a 2nd gen. Obviously a jumble of several eras but it works. I do PABs with a tail resistor rather than the lift (little blue 10-turn on the relay board). You'll have your own opinions there That's interesting. And it appears to remove a bit of the the load on V1 ca...
- Tue Feb 24, 2015 12:44 am
- Forum: Dumble Discussion
- Topic: 3rd Gen w/PAB
- Replies: 6
- Views: 1796
3rd Gen w/PAB
I am planning a 3rd Gen into a cepedals chassis and want to use the PAB feature. I hadn't seen one of these so I sort blended a couple of schem's and had at it. It seems pretty similar to the #124 schematic but R25 connects to S2A rather than S2 common, which seems to be a standard connection for PA...
- Mon Feb 16, 2015 5:57 pm
- Forum: Technical Discussion
- Topic: Incandescent light bulbs and Ohm's law
- Replies: 17
- Views: 2358
Re: Incandescent light bulbs and Ohm's law
Leslie 122 reverb amp uses incandescent to limit drive into the tank, paralleled with a 16 ohm speaker voice coil. Light leaks from under the chassis when cranking it!
- Mon Feb 16, 2015 5:05 pm
- Forum: Technical Discussion
- Topic: Polyfuse/ polyswitch to prevent tubes from redplating.
- Replies: 8
- Views: 1869
Re: Polyfuse/ polyswitch to prevent tubes from redplating.
PIC12F1571 for example, 8 pins, four 10-bit ADCs, 1.75 kbytes pgm, 128 bytes RAM, 128 bytes EE, internal oscillator, $0.66 in singles.R.G. wrote:Come to think of it, why *don't* I go make these to sell??
- Fri Feb 13, 2015 3:20 pm
- Forum: Technical Discussion
- Topic: Fender Style Mosfet Reverb Board
- Replies: 16
- Views: 5551
Re: Fender Style Mosfet Reverb Board
Mosfets do sound very tube like! but for this I do not like the greater frequency range they drive the pan with, I like the sound of that small OT rolling off the bottom and top range like it does for the most part! It does use a conventional reverb transformer so there will be some bandwidth limit...
- Wed Feb 11, 2015 1:49 pm
- Forum: Dumble Discussion
- Topic: Radio Shack 273-1365 xfmr
- Replies: 7
- Views: 1977
Re: Radio Shack 273-1365 xfmr
Today it is back on sale online.
- Tue Feb 10, 2015 1:13 am
- Forum: Dumble Discussion
- Topic: Radio Shack 273-1365 xfmr
- Replies: 7
- Views: 1977
Radio Shack 273-1365 xfmr
RadioShack is bankrupt. Yesterday the 273-1365 transformer, commonly used as a relay supply transformer was on sale on line for $4.99. Today they were all gone. I found two at a local store and bought one. The other was a staple-up return package and looked dodgy. Maybe I should go back and buy it a...
- Sat Jan 10, 2015 9:25 pm
- Forum: Technical Discussion
- Topic: Anybody try "Manhattan Style" construction?
- Replies: 19
- Views: 3966
Re: Anybody try "Manhattan Style" construction?
Back in the day we used to call that "dead bug". I've made a lot of brassboard circuits of RF/IF, even high-speed digital stuff that way up to 200-300 MHz. Short leads, good grounding. Solder up a G10 box on top, paint it, done.
- Fri Jan 09, 2015 10:12 pm
- Forum: Dumble Discussion
- Topic: Bezel for CE Chassis
- Replies: 11
- Views: 1959
Re: Bezel for CE Chassis
I just got a CE chassis today. Very nice. This indicator also is .3125 dia. (5V incandescent) https://www.alliedelec.com/search/productdetail.aspx?SKU=70152565#tab=specs Pricey though, lens and bulb extra. [img:400:267]https://lh6.googleusercontent.com/-UanL1JOhcrk/VLBSB2b2HwI/AAAAAAAAEkw/ZeajXEzfhV...
- Sun Nov 03, 2013 3:11 pm
- Forum: Technical Discussion
- Topic: how are you cutting your circuit board material?
- Replies: 47
- Views: 7515
Re: how are you cutting your circuit board material?
I have been using a foot treadle shear.
- Sat Oct 05, 2013 8:39 pm
- Forum: Technical Discussion
- Topic: Advantages of PTP wiring?
- Replies: 54
- Views: 12302
Re: Advantages of PTP wiring?
Comment on the FB link say it sits on top of the tube socket but I can't see how it connects to the socket from the picture.teemuk wrote:Looks nice but I would hate to repair that.here Is a nice way to use different construction methods Tone King Amplifier