Showing posts with label Brook Electronics. Show all posts
Showing posts with label Brook Electronics. Show all posts

Wednesday, August 15, 2018

Brook Electronics Advert

I might end up with the most comprehensive list of Brook Electronics adverts around.

Thursday, March 15, 2018

Brook 12A Clones Completed

I finally finished my Brook 12A clone build. The looks are early radio amplifier inspired and the build is pretty close to the original Brook. The only changes are much larger chassis, more modern grounding scheme, shielded input and feedback cables.
Changes? I think I am going to finish the bottom boards to match the top and call it done.
Now I need a few pairs of 2A3's or at least two more of the same brand. I've got a pair of sovtek and EH. Ultimately I'd like a quad of JJ's.

There were a few bumps along the way. It was not behaving well at all on first light but Chris helped me chase the gremlins away.

This is of the new happy amp.

One more check up and they go to the big speakers. 

Lessons learned:
Use real hardwood not plywood.
Don't wrap metal chassis in wood.
Don't trust Sams Photofact.
Wear pants while soldering.
Wear pants!

Monday, February 27, 2017

Brook Electronics ALL TRIODES

Brook advert promoting all triodes and minimal distortion.

Thursday, October 6, 2016

HERE IT IS! Brook 1949

Not sure what the earliest Brook advert is but this has to be close.

Tuesday, August 16, 2016

Thursday, July 14, 2016

Brook Electronics 10C3 and 12A3 Advert

Very cool Brook ad. Posting this in anticipation of the clones.

I would love to have a copy of the free technical bulletin and distortion analysis..

Thursday, November 19, 2015

Brook Electronics - The NEW Brook - 1948

The NEW Brook 10 WATT All-Triode Amplifier.
Great ad from 1948. Does anyone have a copy of the Technical Bulletin BK-10. I hope it is out there somewhere.

Tuesday, June 30, 2015

Brook Electroncis Ad - Stage A Music Festival

Another early Brook Electronics advert. I'd much rather listen to a Brook in my home with AC than brave a music festival in the summer...

Tuesday, May 26, 2015

Brook High Quality Audio Amplifier Ad

I think Brook Electronics execs were kings of the small adverts. I keep finding different ones. This one features the Model 10C.
If anyone has the FREE technical Bulletins I would love to see them.

Monday, May 11, 2015

Brook Electronics - Triode Superiority

Brook Electronics Ad
Output 30 Watts
Automatic Bias
Gain 55 to 120 DB

Wednesday, March 25, 2015

Brook Electronics Let Your Ears Pass Judgement

Another early Brook Electronics ad. I've found a few more of these while researching the 12A. I hope to do a 12A clone this year.

Monday, March 16, 2015

Brook Electronics - All Triodes

Yet another Brook Electronics ad. Good marketing towards the triode crowd. I would love to get my hands on the Brook booklet "Better Listening".

Tuesday, February 3, 2015

The Brook High Quality Audio Amplifier - 10C2-A

All triode Brook amplifiers. I still hope to find an original someday. There has to be more than one in Arkansas. The only Brooks I've seen in person are PWK's and they are minty.

Saturday, March 15, 2014

Brook - Has Another Scion

Mmm another Brook ad. This time for the New Model 4 pre-amplifier.
I really like the Brook atomic logo.

Saturday, August 3, 2013


Brook High Quality Audio Amplifiers Ad.
This ad is for the Brook Electronics Models 12A4, 10C4, and 7.
A modern take on the Brook Electronics 12A is on my list of dream amplifier projects.

Sunday, April 21, 2013

Friday, December 4, 2009

BROOK Electronics 12A one of PWK's favorites

I think I've finally found the Brook 12A modification specifically for Klipschorns. Brook and PWK worked on this in the early days of Klipsch. This document comes straight from the Paul W Klipsch archivist Mr.Hunter. At first I thought I had the wrong document because it lists the 6B4G instead of the 2A3 but they are close enough it turns out. The 2A3 and 6B4G are used interchangeably in the 10C and 12A schematics. The Brook 12A 2A3 PP amp was reportedly one of PWK's favorite amplifiers. He talks about it in his interview with vacuum tube valley at the age of 94. The last time I was in Hope, AR I got a good pic of PWK's actual Brook 12A23KI and preamp. It is still in his office. Here is the pic.
* SORRY guys I seem to have screwed up on this one. This is not the PWK mod but a different schematic from the archives. Can anyone identify what critter this is from?  *

This schematic is supposed to be of just the modifications of the Brook 12A to the 12A3KI. If anyone can shed light on this and what it actually does please please comment on this post. Here it is

Here is a schematic I've found on the electroweb.

Here are some great Brook preamp and 12A pics and a stereo pair. My ears crave this setup.

A couple of links.
An interesting post on Brook click here.
A TubeCad article on the Brook by John Broskie click here.

Tuesday, December 1, 2009

Brook Electronics Since 1934

First in the High-Quality Audio Field Since 1934

Brook was among the first consumer Hi-Fi audio companies. Born out of the glory days of the triodes.

Model 22A Integrated

Here is a very detailed 22A schematic.

Model 7 Preamp

Documentation on the Brook models is rare. I have scavenged for what I have posted here and some I haven't but what isn't posted is mostly schematics. That is except the next post which will have an ultra rare PWK mod of the Brook 12A schematic specifically for the Klipschorns.