Oct 112015

While Gary Bronner and I were discussing the upcoming A5 ‘Voice of the Theatre’ project, he was telling me about his recent visit to Sun Audio in Tokyo. It sounded like such a fun trip I asked Gary if it would be ok to share it with all of you, as I thought you’d all enjoy hearing about it.

Here’s Gary:

Akihabara image for Wikipedia

Photo of Akihabara in Tokyo courtesy of Wikipedia

A business trip took me to Japan a few weeks ago and I had a chance to stop by the electronics district in Tokyo, Akihabara. I’ve done this quite a few times and I’ve developed a few places that I like to visit. One of them is Sun Audio, who makes some well known SET amplifiers.

Akihabara map

Akihabara map.

I own one of their Sun VT-25 amps, which I bought on a trip back in 2000. I still use it and think it’s a great bang for the buck amp, or it was for the price that I paid back then. Adjusting for inflation, prices today seem about 2-times higher than what they were 15 years ago. I guess the cost of materials has gone up a lot in recent years.

Sun Audio in Tokyo

The view from the listening position of Sun Audio’s Altec Valencia’s being driven by the PSE 50 amplifier.

When I stopped by Sun Audio this time, I ran into the owner, Mr. Uchida. The shop looked very much like it has over the years, with a small space packed full of amplifiers, speakers, and parts for the DIY’er.

Sun Audio amplifier

“A close up of the PSE 50 amp as it was playing. It was actually upside down with the bottom off, which may have been why it sounded so open!”

The amp in my pictures (above) is the SV-50TSM, which is the new and fancier parallel singled ended monoblock 50 amplifier that Uchida is now building. It’s got switchable balanced/unbalanced input with an input transformer and transformer coupling between the 6V6 driver tube and the parallel 50 outputs. It’s not yet on the Sun Audio website, not even the Japanese page.

Compared to my last visit, which was probably 5 years ago, Mr. Uchida has designed a new series of amplifiers that he seems quite proud of. They are a set of transformer coupled parallel single ended monoblocks. The SV-2A3TSX is a 2A3 PSE monoblock and the SV-TE/50TSX is a PSE 50 monoblock.

Sun Audio amplifiers

A picture of the SV-TE/50TSX amp from Sun’s website.

Uchida-san seemed most taken with the PSE 50 monoblocks and was playing those while I was there. He was using these to drive some Altec horn speakers, perhaps Valencias, but I’m not completely sure of the model.

He played some jazz and a video of the Eagles Hotel California, which sounded very realistic.

Brochure cover

“A few scans from the booklet that Uchida-san gave me announcing the 20th anniversary event of the Akihabara group of shops dedicated to tube audio, high efficiency speakers, and DIY.”

He was using NOS 50 tubes but seemed to also like the Psvane 50s, which he showed have almost identical construction to the NOS tubes. He said they sound a bit more “solid”, by which I think he meant solid state, and that they needed more time to break in.

These amps don’t show up on the English Sun Audio webpage but one can read a bit about them on the Japanese page here.

brochure text page

Brochure text page.


Akihabara store list with web site addresses. Click on the image to expand and make it easier to read the web site addresses.

I found them to be a good step up from the simpler design of his old 2A3 and VT-25 amps, which are still available. But of course they’re about twice as expensive, so they should be better. I thought it worth mentioning these amplifiers since they don’t seem to have gotten much attention in the west.

Gary Bronner

Gary traveling in Hong Kong, seen here after hiking to the top of Victoria Peak.

Many thanks to Gary for sharing his audio adventures with us! I love the looks of that SV-TE/50TSX Sun Audio amp, Gary!

 Posted by at 6:59 am

  2 Responses to “An Akihabara Audio Adventure: Gary Bronner’s Visit to Sun Audio in Tokyo”

  1. Very interesting, thank you for the article. I have a Sun SV-2A3 which continues to get regularly used and is definitely a ‘keeper’ for me.

    • Hi Tony,

      You’re welcome. Every time I visit the Sun Audio website I get the urge to build one of their kits. The 2A3 and EL34 amps both look like they’d be fun.



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