Search found 2375 matches

by soulsonic
25 Nov 2020, 01:39
Forum: Amplifiers
Topic: Small Push Pull tube amp build, advice sought.
Replies: 7
Views: 204

Re: Small Push Pull tube amp build, advice sought.

I'm very pleased with the preamp and phase inverter section of my re-built 6V6 mystery amp. Check out the second schematic I posted that shows how I rebuilt it. I used Merlin's book as a guide and I recommend it. You can then design the power supply and power amp to work with the voltages you have a...
by soulsonic
21 Nov 2020, 00:34
Forum: Parts Sourcing & Trading
Topic: Reticon SAD1024 BBD
Replies: 2
Views: 190

Re: Reticon SAD1024 BBD

Good luck
by soulsonic
17 Nov 2020, 00:23
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EH - Big Muff Pi ( Ram Head, Early Version )
Replies: 151
Views: 62335

Re: EH - Big Muff Pi ( Ram Head, Early Version )

Well, I cleaned it, and it seems fine now.
Replaced all three 10uF electrolytics and it works great now. Sounds very good.
by soulsonic
15 Nov 2020, 20:30
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EH - Big Muff Pi ( Ram Head, Early Version )
Replies: 151
Views: 62335

Re: EH - Big Muff Pi ( Ram Head, Early Version )

Hey, is it normal for these to have annoying scratchy tone controls because of the DC path thru them? The tone control on mine scratches really bad, but I'm reading about 4vDC across it and I can see in the schematic that there is an obvious DC path to ground coming from the collector of Q2 and goin...
by soulsonic
15 Nov 2020, 18:18
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EH - Big Muff Pi ( Ram Head, Early Version )
Replies: 151
Views: 62335

Re: EH - Big Muff Pi ( Ram Head, Early Version )

A friend of mine just gave me his to repair, and it is this version exactly, even same brand of caps. I wonder where this one fits in the timeline? I haven't seen these values listed in the usual version schematics (though maybe I just missed it somewhere). Kitrae thinks the pots in these are usual...
by soulsonic
14 Nov 2020, 18:31
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EH - Big Muff Pi ( Ram Head, Early Version )
Replies: 151
Views: 62335

Re: EH - Big Muff Pi ( Ram Head, Early Version )

here's mine: http://www.naturalbornyoers.com/forumpics/bigmuff.JPG DSC01715.jpg DSC01714.jpg DSC01713.jpg DSC01712.jpg DSC01711.jpg A friend of mine just gave me his to repair, and it is this version exactly, even same brand of caps. I wonder where this one fits in the timeline? I haven't seen thes...
by soulsonic
28 Oct 2020, 05:24
Forum: Boutique Stompboxes dissected...
Topic: Frantone - Brooklyn Overdrive [traced]
Replies: 6
Views: 1523

Re: Frantone - Brooklyn Overdrive [traced]

Hi guys, From the layout on the video, you can clearly see that only C8, C9 and C10 are polarized capacitors. Also C5 is 220nF. Cheers! If you mean the 3 I highlighted here: Brooklyn_Overdrive_HiLight.jpg Then, no, those are not polarized. They're Nichicon Muse bipolar caps. I used them alot, they'...
by soulsonic
26 Oct 2020, 16:36
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Boss bistable multivibrator
Replies: 3
Views: 285

Re: Boss bistable multivibrator

As I understand it they use a bistable multivibrator and a momentary footswitch basicly so the led can light up without tone suck and 3pdt footswitches didn't exist yet. (correct me if I'm wrong!) They use it to switch JFETs on and off to use as the bypass switch. They chose this for a variety of r...
by soulsonic
20 Oct 2020, 03:26
Forum: Boutique Stompboxes dissected...
Topic: Laney Black Country Customs Tony Iommi Signature Boost Pedal
Replies: 23
Views: 2731

Re: Laney Black Country Customs Tony Iommi Signature Boost Pedal

It's not too hard to do an opamp boost with a Rangemaster-like tone. I've done it.
by soulsonic
18 Oct 2020, 00:53
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 21
Views: 1515

Re: 6V6 Mystery Amp

I've been poking around a bit more, researching different amps, and I have found a few examples of Valco amps that used a pair of 6L6 with a 5Y3 rectifier and an undersized looking output transformer. Here is one example: https://reverb.com/item/19448307-1963-airline-montgomery-ward-model-62-9015a-v...
by soulsonic
17 Oct 2020, 20:31
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 21
Views: 1515

Re: 6V6 Mystery Amp

I'd like to know what the 6v6 are running at plate voltage wise and also the kt66. Then how much are they sagging? Just guessing the kt66 can run at 550v and if you have them at 365, maybe that's why they are a bit crunchier. Sound good you have it running. I would have gutted it and made another 5...
by soulsonic
17 Oct 2020, 20:04
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 21
Views: 1515

Re: 6V6 Mystery Amp

Here's where I'm currently at with it. This sounds great: MysteryAmp1Rebuilt.JPG Has a nice clean tone that gives a nice mild crunch when cranked. Seems to respond very well with pedals. Regarding voltages, here's what I measured: HT Secondary, loaded with 6V6: 726VAC With 6V6 and 5Y3 rectifier Plat...
by soulsonic
16 Oct 2020, 22:55
Forum: Amplifiers
Topic: Orange AD-5 Master Volume mod?
Replies: 2
Views: 188

Re: Orange AD-5 Master Volume mod?

What is the impedance of the original speaker? An easy way to cut the amount of power coming out is to put a power resistor either in series or parallel with the speaker out; depending what your desired impedance is. If the amp originally had a 4 ohm speaker and the replacement you put in is 8 ohm, ...
by soulsonic
14 Oct 2020, 22:32
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 21
Views: 1515

Re: 6V6 Mystery Amp

Thanks for the suggestions and insights everyone. I think I'm finished tinkering with this amp (at least for the time being!). I've got it doing what I want now and I'm getting a satisfying tone from it. What I was looking for is something that can put out at least a few watts cleanly and then crunc...
by soulsonic
11 Oct 2020, 05:56
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 21
Views: 1515

Re: 6V6 Mystery Amp

Update on this. I finally got around to trying some 6L6 types with this (got sidetracked with this sweet Traynor I've been fixing up and modding). To be exact, I tried KT66 in it. So, going with mozz's advice, I checked the filament voltages first to be sure the power transformer was OK with them - ...
by soulsonic
30 Sep 2020, 20:07
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 41
Views: 4485

Re: Suhr Reactive Load [schematic]

I see what you mean, but I was looking for clipping not in the power amp circuit itself, but specifically if the line output was being clipped by the LED conducting. In the circuit it's wired the same as you would a clipping diode in a distortion circuit, so I wondered if it would have the same effe...
by soulsonic
28 Sep 2020, 19:51
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 41
Views: 4485

Re: Suhr Reactive Load [schematic]

Did you try running the sweep at a very low level? It looks like you are totally saturating out the .68mH inductor (Or whatever you are using for the top end impedance rise). When an inductor saturates, it will measure as the value of the resistive component, except that it will be going in and out...
by soulsonic
28 Sep 2020, 18:08
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 41
Views: 4485

Re: Suhr Reactive Load [schematic]

Did my tests. Ran a 20hz-20khz sine wave sweep through the Reactive Load. I drove the signal to the load with a large solid state PA amp (Alto APX1500). I didn't measure how much power was sent to it exactly; my criteria was to get the Load's LED glowing brightly and the fan blowing vigorously. Give...
by soulsonic
18 Sep 2020, 15:36
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 41
Views: 4485

Re: Suhr Reactive Load [schematic]

I'm going to do a test of running a clean sine wave thru it via a clean solid state amp, and see what happens.