Jonathan Edward Glynn

Jonathan Edward Glynn

Jonathan Glynn has professional electronic training from Air Force, Military Contracts and Motorola as well as self-education.

Wednesday, 09 April 2014 15:50

Phoenix Rising

Legends of the Phoenix ...


Wednesday, 26 March 2014 18:05

Zebra Head Amplifier

Mill Hill Audio is proud to announce another new design for 2014, "The Zebra Head" amplifier.  A fresh new Mill Hill Audio design providing 50 Watts of vacuum tube power in a hand wired point to point construction style, sheltered in a beautiful Zebra wood cabinet.

Thursday, 13 March 2014 19:37

1954 Ampex Collection

Posted on September 25, 2011


Welcome to my 1954 Ampex 300 Stereo collection.  I call it a collection right now as I am not rebuilding anything until I have completed the collection and know how it will all fit together as a complete thought.  I have changed my mind many times about how to best use this equipment, all the while buying, trading and receiving gifts from Ampex fans who want their pieces to go to a good home and have a place in the future.  I have been building this collection for about 10 years, which includes text, the begining of a spares package and other duplication gear that I do not know how it will all fit together functionally yet.

This Ampex 300 started life in the Military as a data recorder.  All of the tubes are the same, although the input and output transformers are missing.  I view this as a blessing as I am open to various connectivity options.  The basic electronics are very clean without rust… Nice and ready to be reborn.

Mr. Les Paul sittin’ with his Ampex system and his Gibson.  Happy and Old!  Thank you Les for all your work and exploration in the world of music and electronics.   



Ampex 375 for clean power.  I won this one on ebay and drove up to Santa Cruz from Calabasas and took the family for a weekend on the board walk,  fine dining and a nice hotel.  Wonderful town and friendly people up in Santa Cruz.  I wish I could take the time to visit all of the towns I find gear.

An Ampex Fan; I am a Fan of Ampex… With all of these tubes, a nice flow of air is a must.  Another ebay find!  I would not have been able to create this collection without ebay and I would like to take this moment to thank them for all of the hard work they have provided our community.   Viva La Ebay!!!

This is an Ampex 6515 power amplifier with a push pull 807 power tube section.  Peerless power and output trasformers and more clean metal.  Wonderfull point to point wiring and mindful execution.         I need a second one of these 6515′s and a pair of 6446′s which have four 807′s for BASS.

This is an Ampex Equalizer for the duplication of tape media.  It would be nice to have another as I have this one.  Not sure how it will fit into the big picture, but the raw parts are nice and I should be able to build a preamp for one of the channels.  Perhaps someone could let me know what it is for, then I could  use it  for that purpose?!

This is an Ampex 6815 and is some kind of line level preamp without input or output transformers.  Like some of the other pieces, I only have one right now and need another, without actually knowing how it will be used in the big picture.  Perhaps it will be one channel of a record player preamplifier??? If you know what it is used for, please let me know.

A friend of mine gave me this military rack to hold the Ampex bits I have so far.   I will need to find another matching cabinet or a new pair of racks to hold the rest of the pieces once I get the massive 6446′s.  

I also need to figure out some kind of mixing console to mix about 10 microphone inputs down to left and right channels.  I am a fan of Sun Records and the way they recorded everyone at once in a live situation.  I realize there are Altec mixers that could fit this position although I would like to build an Ampex mixer even though there might not be one. 

Perhaps there is an Ampex mixer and I just don’t know of it yet.  If anyone knows, please let me know.   I need a short list of pieces : 1. 1 each 381 Speed Lock Control Track Generator. 2. 1 each 6815 preamp.  3. 1 each 6515 power amplifier.  4. 2 each 6446 power amplifiers. 5.  A second Ampex Fan.  Please contact me at :  This email address is being protected from spambots. You need JavaScript enabled to view it.

Wednesday, 12 March 2014 16:30

Terms and Conditions

Terms & Conditions

Dear Mill Hill Audio Proposed Client,

At Mill Hill Audio we build the world’s finest tube amplifiers by hand in Southern California.  It is my desire to have you come to my gallery and play the proposed piece, hear with your own ears, see with your own eyes and feel with your own heart.   At this point, you would know if this piece of electronics, is for you.

Payment:  At Mill Hill Audio we accept Cash, Money Orders, Checks and Bank Transfers.  We do not accept credit cards as they infringe upon our “No Return Policy”.

Return Policy: I do not support the concept whereby a client shops on the world wide web, listening to digitally altered tone samples, through tiny computer speakers, viewing color samples dithered to be compatible with your browser…  I feel, this level of research on your part, limits your ability to understand what you are doing.  At this point in your confusion the credit card company steps in and says, “Don’t worry, buy it and if it is not exactly what you want, return it”!  When this happens, and it has, my art is subject to shipping company error, non-respectful handling by proposed client and even worse packing from a person who wanted to play with our art for a few weeks, tracking an album or playing the local coffee shops, who knows…  End of the story, our art is returned damaged.  We lose too much energy in playing this game.

I am no fool.  I build nice gear.  I have played all the circuits and know my competition.   If you would like to own a Mill Hill Audio product, please visit.  If you are unable to visit, do your best research and weigh your risks, as there is “No Return Policy”.

Duplication: Mill Hill Audio reserves the rights of creation.  Purchasing a Mill Hill Audio creation does not give you the right to transfer a copy of the work, in real or digital form.

Warranty:  Mill Hill Audio creates electronics with high quality components and assembly is performed to military standards.   Accidents happen, tubes die, time passes and when it does, Mill Hill Audio is the only authorized repair center for Mill Hill Audio products.  Owners are required to pay for parts and labor.

Right to Refuse: Mill Hill Audio reserves the right to refuse any client, so be cool.

Tuesday, 11 March 2014 21:57

Hedgehog Amp

  The Hedgehog is a proper beast. 

Friday, 07 March 2014 03:59

Summer #2 Amplifier

Well, many of you have said you wanted a smaller amplifier that you could play at lower volumes with our quality of sound.

Thursday, 27 February 2014 04:07

Love Amplifier

The symbol on the front of the amplifier is the character for love.

Thursday, 27 February 2014 01:50

Love Circuit

Love Circuit

Friday, 21 February 2014 00:56

Zebra Head Amplifier

Mill Hill Audio is proud to announce another new design for 2014, "The Zebra Head" amplifier. A fresh new Mill Hill Audio design providing 50 Watts of vacuum tube power in a hand wired point to point construction style, sheltered in a beautiful Zebra wood cabinet.

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CONTACT: Jonathan Glynn | 805.415.9878 | California, USA |