duncanamps.com

panman2nd_dan · Joined: 30 Apr 2007 Posts: 4 Location: Swindon, UK

Folks,

It has been a bit quiet recently, so I thought I would post a link to my amp to see what sort of reaction I might receive. Here is the link:-

http://jfranci1.googlepages.com/home

Let me know what you think, good or bad.

Many thanks,

Geek · Posted: Fri Jun 01, 2007 10:18 pm Post subject:

Wow! Nice!!! Very Happy

Now for the questions...

- A two independent channel amp is that?
- Schematic! Very Happy

- That top cab, I haven't seen (yet) whizzer cones on guitar speeks. What are they?

Cheers!
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Gregg

panman2nd_dan · Joined: 30 Apr 2007 Posts: 4 Location: Swindon, UK

Hi,
Yes it is a twin independent channel amp, footswitchable.
The first channel gives a "bluesy" sound, i.e. quite a rich sound,
the second channel is brighter. Both pre-amp stages will give a clean sound up to the half way point on the gain control, and overdrive after that. The second channel gives a more modern distortion, controlled by the FX control, where as the first is just natural drive from the pre-amp valves. Output stage is 2 KT88's in p-p giving a very healthy 50W. The layout is done on individual PCBs for each channel, so that if you want a different pre-amp circuit (different sound) then you just plug out the old board and plug in a new one. The circuits are my own design, but to be honest, how many different ways can you wire up a triode for gain, bass, middle, treble etc.
The top cab has Celestion speakers fitted, and the twin cone arrangement gives a bit more sparkle to the top end.
Many thanks for the feedback, keep it coming all.

Geek · Posted: Sat Jun 02, 2007 6:50 pm Post subject:

Sounds super! Very Happy

panman2nd_dan · Joined: 30 Apr 2007 Posts: 4 Location: Swindon, UK

Hi,

As soon as I figure out how to do that I will. While I play guitar, I am looking for someone else who plays a lot better than me, so that I can record something decent.

BR

jrfrond · Joined: 26 Mar 2004 Posts: 15 Location: New York, NY

Cathode-biasing on the KT88's???
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JR Frondelli

panman2nd_dan · Joined: 30 Apr 2007 Posts: 4 Location: Swindon, UK

Yes, I put about -35V on the cathodes for biasing to give a healthy 50W output.

Shrapnel · Joined: 16 Oct 2005 Posts: 30 Location: Arkansas, USA

I think there was a request for schematics earlier (way earlier considering when I got myself back here.) I, for one, would look forward to perusing those schematics, if you are willing to make them available.
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Rock 'n' Roll ain't noise pollution... neither is my amp Very Happy