65amps?

Tube or solid-state, this section goes to eleven!
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fluzo
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Post by fluzo »

Any info on 65amps? I'd like to take a look at London or Soho schematics, specially de "Bump" feature.

Thank you.

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KHELSTROM
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Post by KHELSTROM »

fluzo wrote:Any info on 65amps? I'd like to take a look at London or Soho schematics, specially de "Bump" feature.

Thank you.
Aren't these heavily based on the 18 watt Marshalls?

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chromaticdeth87
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Post by chromaticdeth87 »

It actually a mixture of 18 watt derivatives and ac-15 and 30 tweaks. The amps are not really anything "new" per se, alot of these mods have been around for a while.

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fluzo
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Post by fluzo »

chromaticdeth87 wrote:It actually a mixture of 18 watt derivatives and ac-15 and 30 tweaks. The amps are not really anything "new" per se, alot of these mods have been around for a while.
Do you have the "Bump" switch schematic? I'm specially interested in that feature. Thanks.

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chromaticdeth87
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Post by chromaticdeth87 »

I don't but, look at some of the "contour","boost", or "depth" switches on other amps, this is usually just a capacitor network connected to either a gain stage, tonestack through a switch. Check out the "structure" switch on the XTC schematic on blueguitar.org or schematicheaven. what you'll find is the switch just switches in and out a cap or RC network that will boost or limit certain frequencies in the circuit. plenty of amps have this. What the 65 amps have specifically I couldn't tell you but if you'll search the 18watt.com forum I'm pretty sure they could tell you.

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fluzo
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Post by fluzo »

Thank you I'll try that.

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