Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Colas LeGrippa on February 11, 2014, 10:58:04 am

Title: KINGSLEY amplifiers are tuners !!!!!!!
Post by: Colas LeGrippa on February 11, 2014, 10:58:04 am

Hi folks, I am back here after months on the road ( long and winding....).
I had to service a KINGSLEY amplifier yesterday which was picking up RF. Clean layout from the circuit point of view. Cab, tolex, grill cloth, back and face plates are poor. Bad installation and design, Anyway this is an early model and according to their website, things have changed :  http://kingsleyamplifiers.com/ (http://kingsleyamplifiers.com/)
Poor circuitry design as well: both inputs are not shunting to grnd when no cords are plugged in and no grid stoppers on V1 : the cause of picking up RF. I installed two 68k right on to V1 grids and it cured the problem. Here's some pics.

Colas

Title: Re: KINGSLEY amplifiers are tuners !!!!!!!
Post by: eleventeen on February 11, 2014, 08:18:42 pm

Those are some nice fat transformers for what appears to be a quad-EL84 amp.

One thing I would do differently is to have two branches of heater wiring and not run heater wiring over the parts board!

Title: Re: KINGSLEY amplifiers are tuners !!!!!!!
Post by: Colas LeGrippa on February 12, 2014, 11:01:45 am

right on, class a with switchable output for 15 or 30 watts

neat layout but a couple of odd things like the heater leads