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Topics - tonyharker

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Preamps and Effects / Preamplifier Input Impedance
« on: February 22, 2014, 05:50:02 PM »
Guitar preamplifiers often have a very high input impedance >500k but what is the optimum impedance to load a pickup.
Is it higher or lower than this assuming the pickups are not active types.

Edited to remove typo.


The Newcomer's Forum / Soundking Amplifiers
« on: September 12, 2011, 02:34:58 PM »
Does anyone know anything about these amplifiers.  Made in China.
Just won one on eBay for 5 would you believe. A 20watt "Practice" amplifier with digital reverb.
Reverb not very good. A bit like extended echo if you know what I mean.
Seems to work alright uses a TDA2030A in the output, into a 4 ohm speaker rated at 30 watts.
Sounds OK except for the reverb.

Amplifier Discussion / Custom Sound Trucker Bass Amp
« on: August 19, 2011, 11:05:24 AM »
I've just won one of these on eBay and was wondering if anyone knew anything about them.  I understand that Custom Sound (in Pudsey in Yorkshire) was taken over by FAL (Futuristic Aids Ltd) but nothing else. 
It is SS with 2 2N3773s in the output and is supposed to be 65watts.  It has a 15" speaker which is like new, but has no markings on it. It has had the back stove in but sounds OK.  No idea when it was made.

Does anyone know anything about these and where I can get a circuit for it, although it probably wouldn't be too difficult to trace it out.


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