Get Set Go with KT88

[gtasound]

Did anybody ever try to build the GSG with a triode connected KT88, is it possible to do so.

[Shannon Parks]

Probably a triode-strapped KT88 Clementine would be the more straight-forward route. I've done that.

Shannon

[gtasound]

Thanks for your reply shannon, how did it sound and what was the power out

[Shannon Parks]

Alas, I merely biased it up along with a bunch of other tubes and ran my audio tests with no further listening tests. Looking at my notes for a trioded KT90, I got 4.75W on a stock Clementine with a 800mV input.

Shannon

[gtasound]

Thanks Shannon,

power output of 4 to 5 w is pretty good, was this running with a tube rectifier or SS diodes on board.

Also i am interested in the GSG to run 2A3's instead of 6b4's I guess we will
need extra 2.5v filaments and what else is needed to make this work.

I have at this point never build a tube amp but very much interested in building a Set amp.

[TomMcNally]

Having built over 20 get*set*go amps, may I suggest you try the
Sovtek 6B4G's and make things simpler and the way the designer
intended. 6B4G's are the EXACT SAME tube as a 2A3, just in a
more modern base (8 pin instead of 4) and with a 6 volt filament
instead of 2.5 volts.

The get*set*go is designed with 6 volts DC on the filaments,
you can't easily change that. If you powered the 2A3's with
two filament transformers, you would bring up the hum level
that Directly Heated Triodes are famous for.

The get*set*go is a great amp, I can build one in a few hours
and get perfect results every time.

I've built a few with 300B's which is a simple resistor change
and the DC filament supply stays intact. Another secret
and tube to use is the 6AV5GA. You can save $ 80 and have
a superb sounding amp.

Here are a few of mine ... notice that I like the black Hammond chassis.

... tom







... tom

[dougm216]

I'm with Tom. My last build was a 6b4g straight on. It's still running in and sounds great..

[gtasound]

Thanks all,

looks like Tom you been very busy building all those good looking amps wish I could build like that.

The reason for wanting to go for the 2a3 or Kt88 amps is because owing a SE KT88 NFB triode connected and a 2A3 pp which can also be used as a 45 pp amp.

I do not like to be held ransom by the prices of the 6b4 which are double of the sovtek 2A3, not having any know how of building tube amps the 300b is to much of a tube to try at this point.

The 6av5 is probably a good tube to try but it is not current production and to many version around, have done some research on this tube.

Looks like the Clementine is the way to go using the 6L6 or KT88, lots of tube rolling option without robbing the bank.

[gtasound]

Question? which board would be more suitable for a triode connected 6v6gt or el84 set amplifier, the GSG or Clementine.

[TomMcNally]

The get*set*go board is designed for the 6B4G directly heated
triode, and teh Clementine is designed for 6L6's.

6V6's and EL-84's might work if you get the voltages right.

Why not build the board with the tubes it was designed for?

Tubes are the cheapest part of the build.

[gtasound]

Thanks for your replay and recommendation but my question was not answered.

[TomMcNally]

Correct. Neither, they were not designed for those tubes.

[Shannon Parks]

Question? which board would be more suitable for a triode connected 6v6gt or el84 set amplifier, the GSG or Clementine.

Definitely the Clementine. The Clementine is basically a GSG without the filament scheme for a DHT (namely a 6.3V tube like the 6B4G but also 5V for a 300B) and 6AX5GT rectifier. You can use it as a single ended driver for lots of tubes.

Shannon

[gtasound]

Thanks Shannon,
your input was very much appreciated, this is what I thought would be possible with one of your boards, had another look at your 6l6 schematics and see that the 6.3v filaments are provided by the power transformers.

How do I go about ordering and may need some help in implementing a 6v6 or 6aq5 triode connected amp.

[gtasound]

Sorry I did not look very close at the red Clementine board before, I noticed that the tube pin holes are for 8 pin sockets which rules out any other
tube type am I right?.