Showing posts with label Knight. Show all posts
Showing posts with label Knight. Show all posts

Thursday, March 1, 2018

Knight Kits Advert

I have a few Knight Kit amplifiers. I must admit I did not know they were  Allied products. Nice gear for the day.

Tuesday, September 6, 2016

Formerly A Knight KB83

I bought this Knight stereo amp years ago at an auction. I tried to rebuild it to its original state but the voltage was soaring and the circuit boards were a brittle nightmare. They were not taking to the constant work. I called it quits. My good friend Chris Hornbeck was kind enough to draw up a fresh more modern schematic. The chassis tubes and transformers were great so that is all we kept.
Forget what I said fortunately Chris chimed in with a comment:
Chris Hornbeck
Signal path is all push-pull, differential input with CCS, cathode follower drivers, plate and cathode loaded triode connected outputs, separate cathode resistors with 1000uF bypasses to 0 and 32 Ohm taps, 8 Ohm tap to signal ground. No long-loop feedback, extensive decoupling to input stages.

Power supply is dual GZ34's to 10uF Solen/ factory choke/ 4x100uF to outputs, then 20Hy/C/R/C to inputs. Bottom of supply lifted by 5V for CCS supply.
 This amp was a kit and has never worked properly until now. The orginal builder just never got it to work so I got all nos tubes with it. That is four EL37 and two GZ34 rectifiers. All mullards  except the 12AX7 amperex and 12AU7 also mullard are just from my stash.
 If I ever get the schematic corrected I'll post but it was very challenging getting everything to fit in the snug chassis. I'll always afford myself more room than this... I don't like rebuilds but prefer scratch... 

Anyway it is quiet on my 107db1w1m Klipsch Jubilees so what else could one ask for but just a few easy mods and it be done lol....

Tuesday, March 29, 2016

A Laboratory Report On Stereo Amplifier Kits - Part 1

 1962 article on DIY amplifier kits of the day including Heath AA-121, Knight KB-85, Dynaco Stereo 70, and EICO HF89K. Part 2 will be posted Thursday.

Thursday, January 21, 2016

1961 Laboratory Report On Integrated Stereo Amplifiers Part 1

Here is a very cool Hi-Fi Stereo lab report on integrateds available in 1961.

Thursday, September 10, 2015

Knight Kit 12 Watt Amplifier

Cute little Knight Kit amplifier from Allied Circuit Handbook. I'm going to check my Allied Catalogs for more information on this little guy.


Thursday, March 19, 2015

1930's Knight Tube PA Amplifiers Ad

I didn't realize Knight was operating in the 30's. These are for PA systems of the day and were operating at higher wattage into Class B.

Wednesday, February 25, 2015

Very Early Pro Sound - Field Coils with Horns and Triodes 245 250

This is one of my favorite early ads because it has it all like field coils, horns, triodes in the flavor of 250 and 245.

$20 in 1930 equals about $275 today.
 Nice selection of field coils from the early guys Jensen and Utah.
 I want everything I build to look like these early pro amps.

Monday, March 31, 2014

Knight Kit Stereo Preamplifier 83 YX 776

 This is the preamp documentation that came along with my amp. To be honest ever since trying the Slagle AVC I've given the middle finger to preamps. Since I haven't seen it out on the electroweb I'll post it here.