Successful TPU-ECD replication !

[otto]

Hello all,

thanks Marco

Otto

[ronotte]

@Otto,

all the mentioned tube oscillators are FOR HIGH FREQUENCY operations. For our range of operations: Hz to at least 300KHz you need a low frequency ocillator: so better don't use Colpitt, Hartley, etc.

YOU MUST SEARCH FOR example WIEN BRIDGE OCILLATORS or similar: they are very stable (using stable R C ), low distorsion...... and were generally used for HI-FI setup.

If you look on E Bay there are still H&P (200 model) wien bridge tube based osc for a very low cost as nobody want them any more!

Roberto

[otto]

@Roberto

thanks. Now, when I have a good setup with my coils Im not able to pulse them,ha,ha. Thats live!!!

I want to say you why I cant pulse my coils: I have sooooo dirty signals that they very easily burn my MOSFETs. This signals, seen as hash on the scope, I hear on my radio on AM and FM and maybe my neighbours are wondering whats going on with their radios. Its logic that I need clean signals. This clean signals I can only have with tubes.
As I have only 2 of your IRFP MOSFETs I will use a combination of them with a IRF 840 so I can continue to work.

Of course, I will try to build my tube oscillators because at this "stage" of discovering the TPU I see it at the only possibility to make my "job".

Otto

[ronotte]

@Otto,

here is a generalized phase-shift tube audio range ocillator complete with formula.

Roberto

[otto]

@Roberto,

thanks. I think I have a lot to do the next days. Its really a $%&/ that you dont use tubes. Maybe I have to buy you some of them,ha,ha.

Heeeej, its not a problem to build the chassis. Just a piece of metal.  Heeeej, f..k MOSFETs!!!! Come on. Ha!!! An idea: my chassis are made from PC power supplies. I had only the metal chassis and inside them are my tubes, in another is my power supply....

Otto