Dario Valve TF 364 help! - UK Vintage Radio Repair and Restoration Discussion Forum

Final anode · 9th Dec 2019, 7:59 pm

I have a Dario TF364 B4 base. Set up in the Avo mkiv it measures like a PX25A, 350v - 90v it draws 65ma.
Does anyone have any info on this valve, cannot find anything on the web.

Mr Moose · 9th Dec 2019, 10:41 pm

Hello,
From the internet.
Filament 4V 2A, Anode Volts 400, Grid Bias -92V, Anode Current 63mA, Anode Impedance 3000 ohms, Mutual conductance 3.8 ma/V.
(The TF104 is the Dario equivalent for the PX25.)
Yours, Richard

Final anode · 10th Dec 2019, 1:20 am

Many thanks Richard, I thought it was a PX25A equivalent, though its straight not a coke bottle shape, have you the link please to were you got the info. Ta

Final anode · 10th Dec 2019, 11:22 am

Thanks for the quick reply, please do you have the link for the TF364 data.

Mr Moose · 10th Dec 2019, 12:38 pm

Hello,
The information comes from a picture of a 1939 Dario Valves wall chart on ebay but discussion of ebay items is banned under most circumstances on this site.
I have attached a picture of the relevant section below.
Yours, Richard

Final anode · 11th Dec 2019, 7:39 pm

Thanks Richard, that's great we'll spotted!

9th Dec 2019, 7:59 pm	#1
Final anode Triode Join Date: Dec 2019 Location: Pontefract, West Yorkshire, UK. Posts: 16	Dario Valve TF 364 help! I have a Dario TF364 B4 base. Set up in the Avo mkiv it measures like a PX25A, 350v - 90v it draws 65ma. Does anyone have any info on this valve, cannot find anything on the web. Attached Thumbnails

9th Dec 2019, 10:41 pm	#2
Mr Moose Octode Join Date: Jul 2008 Location: Gloucestershire, UK. Posts: 1,043	Re: Dario Valve TF 364 help! Hello, From the internet. Filament 4V 2A, Anode Volts 400, Grid Bias -92V, Anode Current 63mA, Anode Impedance 3000 ohms, Mutual conductance 3.8 ma/V. (The TF104 is the Dario equivalent for the PX25.) Yours, Richard

10th Dec 2019, 1:20 am	#3
Final anode Triode Join Date: Dec 2019 Location: Pontefract, West Yorkshire, UK. Posts: 16	Re: Dario Valve TF 364 help! Many thanks Richard, I thought it was a PX25A equivalent, though its straight not a coke bottle shape, have you the link please to were you got the info. Ta

10th Dec 2019, 11:22 am	#4
Final anode Triode Join Date: Dec 2019 Location: Pontefract, West Yorkshire, UK. Posts: 16	Re: Dario Valve TF 364 help! Thanks for the quick reply, please do you have the link for the TF364 data.

10th Dec 2019, 12:38 pm	#5
Mr Moose Octode Join Date: Jul 2008 Location: Gloucestershire, UK. Posts: 1,043	Re: Dario Valve TF 364 help! Hello, The information comes from a picture of a 1939 Dario Valves wall chart on ebay but discussion of ebay items is banned under most circumstances on this site. I have attached a picture of the relevant section below. Yours, Richard Attached Thumbnails

11th Dec 2019, 7:39 pm	#6
Final anode Triode Join Date: Dec 2019 Location: Pontefract, West Yorkshire, UK. Posts: 16	Re: Dario Valve TF 364 help! Thanks Richard, that's great we'll spotted!