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Messages - syndromet

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Preamps and Effects / Re: Hiwatt-based preamp
« on: August 18, 2006, 10:25:08 AM »
Sounding good! Nice solos...
Thanks. Don't know about the solos, though, as there is a lot of laatency on my soundcard, I miss the high e on my les paul, and the playing was really sloppy.

So, does it sound anything like a Hiwatt?

Preamps and Effects / Re: Hiwatt-based preamp
« on: August 18, 2006, 09:38:24 AM »
Here is a few soundclipps that does it a little more justice than the earlier ones... Backing is with gain and vol at 12, while the solos are with the knobs dimed. The playing sucks, as everything you hear is first take. It's recorded Guitar -> Hiawatha -> SB Audigy SE -> Cab sim in Guitar rig.

Single coil

Preamps and Effects / Re: Hiwatt-based preamp
« on: August 17, 2006, 11:01:06 AM »
Wait... just noticed that you went with a tone control instead of a full tone stack (treb, mid, bass)... was that just to make it simpler?

Yes. The TMB controll from the hiwatt schem can easily be put back in place, but for stompbox-use, I figured 6 controlls and a swich was a little too much. I'm allso a "less is more" kind of guy, and I figured that a bright switch, a tone-, middle, and bass-knob and a presence knob was to many ways for me to change the voicing. A TMB-tonestack
always give me a headache, as I feel I have to twist knobs for hours to find a sound I like. Thats why I like the simplicity of a simple knob.

It would also recuire a somewhat larger layout, but it can easily be done. If you have the oppertunity to wait a few days, I might be able to draw up a new schem and layout with the full tonestack. I think this circuit could benefitt from the full tonestack, as I've heard much of the "Hiwatt-magic" lies in this tonestack. Nyway, it makes a pretty good overdive with the tonestack that I've added, but I would really like to change the tone-circuit a little, as it doesen't have that much affect on the sound. Anyway, I like this enough to use it as my main overdrive, but I might be a little biased.  :tu: Thats why I would like to hear what others think.

Preamps and Effects / Re: Hiwatt-based preamp
« on: August 17, 2006, 10:36:31 AM »
This preamp add a great distortion when the knobs are turned all the way up, and there is a lot of different sounds playing with the gain and volume controlls. It can go from a clean, sparkley sound to a classic rock-type distortion/overdrive. I guess it sounds a lot like a hiwatt, and when cranked it sound like a tube-amp pushed hard. I really like the sound of this, but I really wish I could get the presence-controll to do something. I don't have a lot of time to work on stompboxes these days, but when I'll get the time I'll try to get the presence to do something.

Running this on 18 volt would give you a lot more headroom, giving you less distortion at higher volumes. Running this on 18v I guess this will be a really good tube-like preamp, giving a great breakup ehen pushed. I'm planning on trying this when my Lm1875 amp is finnished.

I changed the Gain and Volume-controlls on the schem and layout, but they should be 500k as they were on the first schem. The reason I changed them was that I had misswired the pots, so they didn't work propperly.  8) When wiring things up the right way, 500k turned out to be theperfect value.
Even if the precence controll doesen't work at the moment, I encourage you to build this. As soon as I get the presence controll to work, it will (hopefully) only be a few components that should be changed. I would really like the feedback from someone who knows what a Hiwatt sounds like.

I finnished the box for this earlier today, so I'll post pics and soundclipps when it's finnished.

Schematics and Layouts / Re: TDA2003 practice amp
« on: August 11, 2006, 06:36:51 AM »
This looks like a fun project!!
I made a quick PCB for it.

It's not verified yet, though.

Schematics and Layouts / Joe Davisson's new Guitar amp
« on: August 10, 2006, 02:25:45 AM »
Joe just posted this over at
if it's anything like his other circuits, it's deffinitly worth checking out!

Amplifier Discussion / Re: Earth Sound Research
« on: August 09, 2006, 03:53:53 AM »
I've never even heard of Eath amps.... Nice forum though. Needs a few more people, though.

Amplifier Discussion / I found myself an enclosure.
« on: August 08, 2006, 03:40:03 AM »
I have been visiting the dumpster for electronic garbage lately, picking up old HI-FI components for parts. I'we aquired a lot of transformers, tropical fish capasitors, those cute silver caps from the 70's and old ge diodes and transistors.

Yesterday I found an old Tandberg radio reciver in great condition. It should be easy to modify the front to have only one volume controll, and I'm planning to change the backlite frequenzie-indicator to a logo. The top and sides are beautifully figured teak, and the front is brushed aluminium and glass. I think it's going to look supercool!!!

The radio is made in 1974,and have an extreme number of high quality capasitors. I still havent checked the voltages from the transformer, but it looks solid and huge, with 120. 220 and 240 V primary. The secondaries have 8 pins, so I guess there will be a wide array of voltages to select from.

So, here is what it looks like:

I've spent the weekend reading about transformers, and I must say things are a little clearer now. Thanx for the link, RDV!

I also ripped apart another non-working HI-FI amp, and found a 12V center tapped transformer. The amp was actually pretty simular to the 1875, so I guess this will be a good transformer for this purpose.

I also measured the transformer I had lying around from my old Pioneer amp. It gave 20V center tapped. Any idea what I can use this for?

Now I'm waiting for my custom made enclosure (It's nice to have friens working in the alu-industry ;)).

Preamps and Effects / Re: Hiwatt-based preamp
« on: July 25, 2006, 04:03:30 AM »
I dunno, I never use the neck pickup on the guitar I have now.  I really like bridge pickup sound.

I know what you mean. I used to be a metal-to-the bone kind of guy, always using my bridgepickup. I actually thought about ripping ot the neck pickup, and make the cavity a place to put pyrotechnics. Glad I didn't do that.....

As the year envolved, I found that I started using the middle-possition more, and more, with the volume of the bridge a little higher than the vol of the neck. This fattens up the sound when riffing, and when it's time for a solo, you just flick the switch to the bridge possition. Also, if you're using octave effects, they sound a 1000 times better with the neck pickup and tone rolled down. Now I can't see myself playing a guitar without a neck pickup.

what would happen i I bridged the + sides and - sides? like this:

This is the Transformer:
Transformer 1
Transformer 2

I found a ransformer with  18V, but it only has 2 wires on the secondary side. Vould that work, or do I need one with 4 wires?

Preamps and Effects / Re: Hiwatt-based preamp
« on: July 21, 2006, 09:16:39 AM »
Yes, it's a Standard. I've played a few specials, and some of them are prety good. I don't think you'll save anything on buying a special, since they need a a major upgrade in the hardware section to be useable.

I'ce never tried a JR yet, but I thinkI would miss the neck pickup if I did. I'm sure it's a great guitar, though.

Preamps and Effects / Re: Hiwatt-based preamp
« on: July 21, 2006, 08:36:16 AM »
That is my trusted Epiphone Les Paul. It's a great giutar, but you have to try them out if you're buying one. Some of them are realy bad too. I used to have a set of di-marzios in it, but found out I like it a lot better with the stock PU's. This guitar gets better for every year that goes, and I'we never had a problem with it for the nine years I've owned it. Top quality for a great price.

Preamps and Effects / Re: Hiwatt-based preamp
« on: July 21, 2006, 06:00:32 AM »
The last two clips sounded very good. By swapping that fet you lowered the gain of the first stage, right? It really made a difference, IMO the first two clips sounded pretty bad while the last two had a "smooth" overdrive sound that I really like. Did you rebias or make any other changes (with MPF102 the circuit sounds less bright)?

I found the circuit to be a little brighter and "rounder"-sounding with the mpf102 in the first stage. The mpf lowers the gain of the first stage, wich affect all the other fet's aswell. IIRC, I had to rebias when installing the mpf. I had to do this at realy low volume, so it's not correctly biased. Thats why it sounds gated and fuzzy. When the bias is set correct you will have a very nice classic rock sound, without the "Fizz" you hear on the mpf102-clipps. (and j201, for that matter). I'll try tweaking it this weakend, and post some new clips, this time with a tuned guitar.... :P

The circuit also have a huge volume-boost, so I think this could be a nice preamp for a chipamp. I'll test it as soon as I find a transformer for my lm1875 kit.

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