300b lovers

I have been an owner of Don Sachs gear since he began, and he modified all my HK Citation gear before he came out with his own creations.  I bought a Willsenton 300b integrated amp and was smitten with the sound of it, inexpensive as it is.  Don told me that he was designing a 300b amp with the legendary Lynn Olson and lo and behold, I got one of his early pair of pre-production mono-blocks recently, driving Spatial Audio M5 Triode Masters.  

Now with a week on the amp, I am eager to say that these 300b amps are simply sensational, creating a sound that brings the musicians right into my listening room with a palpable presence.  They create the most open vidid presentation to the music -- they are neither warm nor cool, just uncannily true to the source of the music.  They replace his excellent Kootai KT88 which I was dubious about being bettered by anything, but these amps are just outstanding.  Don is nearing production of a successor to his highly regard DS2 preamp, which also will have a  unique circuitry to mate with his 300b monos via XLR connections.  Don explained the sonic benefits of this design and it went over my head, but clearly these designs are well though out.. my ears confirm it. 

I have been an audiophile for nearly 50 years having had a boatload of electronics during that time, but I personally have never heard such a realistic presentation to my music as I am hearing with these 300b monos in my system.  300b tubes lend themselves to realistic music reproduction as my Willsenton 300b integrated amps informed me, but Don's 300b amps are in a entirely different realm.  Of course, 300b amps favor efficient speakers so carefully component matching is paramount.

Don is working out a business arrangement to have his electronics built by an American audio firm so they will soon be more widely available to the public.  Don will be attending the Seattle Audio Show in June in the Spatial Audio room where the speakers will be driven by his 300b monos and his preamp, with digital conversion with the outstanding Lampizator Pacific tube DAC.  I will be there to hear what I expect to be an outstanding sonic presentation.  

To allay any questions about the cost of Don's 300b mono, I do not have an answer. 




@lynn_olson Another nice to read recollection of a History of Amp Design and the connections made over the years 'pardon the pun'.

Some of the content once more Jogs my Memory.

I recollect my 845 Power Amp designer/Builder, requesting that I keep him in the loop if any EE support is required during ownership.

Again as a recollection, it was made known there was their own Hooks in the Circuit Design, that was beneficial to creating the perception the sound produced was transparent.

I am now wondering if this was a similar description to your own, where creative thinking has been used to produce circuits with the potential to align the SET - P-P sonic where there is seemingly a mimic, rather than a contrast.

I am due to spend time with the EE, in the not too distant future, My Balanced Pre-Amp will soon be complete. Which will then be passed onto the EE, who is to work on the 845 mono's, whare a Balanced Design is to be produced, with the Single Ended option retained.

I have been a friend and loyal to this EE's Services for more than 30 Years, I think that has proved sufficient as a 'NDA' about his early works. 

As an aside, a few individuals have asked to see inside the Power Amp. One  individual wanting to make a mark in the audio world, who I knew quite well, and have not at present not communicated with for quite some time, attempted on more that one occasion to be allowed to take the Power Amps Base off and see the Circuit.

My not being supportive, at one time lead to my being threatened that I was on my own with any future EE concerns, if l did not accommodate the request. For other reasons relating to this individual, I am on my own 'Hey Ho'. I'm pleased I 'stuck to my guns' and honoured the Designer /Builders request , and I certainly am not on my own where EE support is needed.

Lets hope owners of your New Amp design, do not find themselves meeting Pirates scheming to steal another's IP.       


There are only a few things one can do to keep someone from pirating a design.   Point to point wiring and manufacture avoids circuit boards.  When someone sends a PCB design for manufacturing, there have been cases when designs have been stolen.  That said, there is little that can be done to eliminate someone tracing out the circuit.  I used to restore vintage tube gear years ago and one major American manufacturer would actually use regulator and other chips whose labels had been erased so you couldn't tell what part they used.  They guarded the schematics of course, so you simply could not repair their gear unless the problem was obvious.  

One just has to hope that owners are honest.  I have never had a problem with the issue.  I suppose should this design become wildly successful, someone may wish to steal it.  The power supply is non-standard and would be a little more difficult to copy, but the possibility exists.  So be it.

I might add that these preamps and amps will be produced by Spatial Audio Lab in Salt Lake City, UT.  The builders are young and will be around for a long time.  Should they ever need repair it will be easy shipping.  They should be quite reliable though.

When time served EE's who have leaned toward and made Valves a Circuitry, they have dedicated themselves to, there is a lot on offer under the hood, that should be very reasuring.

As for reliability, my Amp's have been on the Oscilloscope for numerous Hours/Weeks prior to them being released to me.

Never have the Amp's in all the time of ownership needed to be returned to the Designer/Builder EE due to any change in their performance from general usage.

I do have a Balance Pot' that I have damaged during Transit coming home from a public attended event I exhibited at, they were incorporated to assist with correcting Psycho Acoustics.

This will be checked out when the EE, has the Amp's for the circuit change, where a Balanced configuration is to be added.

I am thinking these Pot's could now be removed?, as the Mono Pre-Amp's, which are my end game keepers, are each with a VC.