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[TCML] Re: Help with VTTC build(HF-201)



Thank you.  I will try that.

 

From: derstrom8@xxxxxxx <derstrom8@xxxxxxx> 
Sent: Tuesday, September 14, 2021 7:15 AM
To: mike@xxxxxxxxxx; tcml@xxxxxxxxxxxxxxx
Subject: Re: [TCML] Help with VTTC build(HF-201)

 

>> But I may be looking in the completely wrong direction 

 

 

Perhaps more literally than you think? Have you tried swapping around the grid coil leads to make sure the coil is not simply phased incorrectly?

 

 

Best,

 

Matt Lewis, Fairlee VT



-----Original Message-----
From: MIke Widlar <mike@xxxxxxxxxx <mailto:mike@xxxxxxxxxx> >
To: tcml@xxxxxxxxxxxxxxx <mailto:tcml@xxxxxxxxxxxxxxx> 
Sent: Mon, Sep 13, 2021 10:45 pm
Subject: [TCML] Help with VTTC build(HF-201)

I'm looking for a direction to bring my project to life.  I'm attempting to

build a VTTC using a HF-201 vacuum tube.  I've attached the tube specs, as

built schematics and text file from JAVATC of my coil.  I am not seeing any

oscillation with my build.  For the plate voltage, I am using a large 1300

VAC transformer with a voltage multiplier.  It is using a Veriac to control

the input transformer voltage to allow control of the plate voltage.  I

have a suspicion that I don't have enough turns on the grid coil to induce a

large enough grid current, but I may be looking in the completely wrong

direction.  

 

 

 

Any input would be greatly appreciated. 

 

 

 

 

 

Thanks,

 

 

 

Mike

 

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