I'm getting quite a few emails asking for updates on the Tram2:

We're pretty well there. The current design will grow one more tube, a 6AS7. This will allow us to expand the range of DHT that can be used without major circuit changes. As seen here we can change 2A3 and 45 on the fly.

Microphonics was a big problem early on but this has been solved using floppy tube socket mounting and selectable output gain, 12, 3 and -6db gain, as well as a few other tricks. I think most tubes can be used. The first build could only use a pair of NOS 45's we have. With all others it was the Gong Show. All the new manufacture 2a3/45's have much larger glass bodies than NOS and support the filament with spring tension and so ring like Big Ben at noon. The Shuguang 2A3 were the worst - looks like pen springs used. But now we are able to use every tube we've tried - about 8 different types including Shuguang, TJ, and NOS types.
Also selectable ouput gain means linestage gain can be matched to speaker efficiency.

You can see we've made good use of the Technology Bites Series of modules we sell.

Noise was solved using a very low noise filament supply implementation.
We've used the ABS (auto bias system) to safely exploit the benefits of fixed bias. This allows getting rid of the cathode capacitor and using a single low value, high quality resistor on the cathode. At the linestage level, these design touches are very noticeable, more so than down the signal chain.
The FCUPS (Film Cap Universal Power Supply) supplies the DHT B+ which also uses a CCS for the anode load. This might seem like overkill for a linestage but if we want a big sound we need big tubes and big power supply. The FCUPS does everything the original Tram regulated power supply did -- and more. The DIYHFS theme song is: No Electrolytics! so we use film caps as much as possible.

The for sale version of the Tram2 will have an option for the UVC (Universal Remote Control) with 126 steps and 6 inputs (if we can find enough space on the back panel).

So what are we waiting for?
Transformers. Soon as we get them in stock we will do the build, shoot the pics for the manual and list them. Price to be fixed later when all costs are in.

Oh yeah, the sound: This is No Sacrifice Sound. The last 7 years I've gone back and forth between TVC and active; each has its merits. But the Tram2 does it all. Huge dynamics with all the inner detail and transparency of TVC.

This is The One!

regards
Brian