bad 5ar4?

sturmj · 11th February 2009, 06:18 PM

I'm trying to get a st-70 clone kit to work. A trouble shooting page said to check for continuity between pin 4 & 6 (comming off of each plate), it didn't say weather there should or not be continuity. On my tube there is not, I assume this means it's bad. I would appreciate any help you people could give me!!!

boywonder · 11th February 2009, 06:51 PM

The TDSL tube data web page is a great reference to see tube pin-outs. Here is the data for the 5AR4

http://tdsl.duncanamps.com/show.php?des=5AR4

Pins 4 and 6 are the two anodes, and should not be shorted, so your tube is probably fine (barring any other issues).

Johan Potgieter · 11th February 2009, 07:09 PM

Sturmj,

As Boywonder said - but for completeness sake, you did not mention whether the 'trouble shooting page' meant in circuit or not. In an operational circuit there will of course be "continuity' in the sense that the resistance of a power transformer secondary will be measured there. I would guess about 100 - 150 ohm depending on the transformer.

(Rather strange advice in those pages. One should define continuity; also not sure why they chose that particular item to check for - nevertheless.)

11th February 2009, 06:18 PM	#1
sturmj diyAudio Member Join Date: Jan 2009 Location: Minneapolis, MN	bad 5ar4? I'm trying to get a st-70 clone kit to work. A trouble shooting page said to check for continuity between pin 4 & 6 (comming off of each plate), it didn't say weather there should or not be continuity. On my tube there is not, I assume this means it's bad. I would appreciate any help you people could give me!!!

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11th February 2009, 06:51 PM	#2
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	The TDSL tube data web page is a great reference to see tube pin-outs. Here is the data for the 5AR4 http://tdsl.duncanamps.com/show.php?des=5AR4 Pins 4 and 6 are the two anodes, and should not be shorted, so your tube is probably fine (barring any other issues).

11th February 2009, 07:09 PM	#3
Johan Potgieter diyAudio Member Join Date: May 2005 Location: Pretoria, South Africa	Sturmj, As Boywonder said - but for completeness sake, you did not mention whether the 'trouble shooting page' meant in circuit or not. In an operational circuit there will of course be "continuity' in the sense that the resistance of a power transformer secondary will be measured there. I would guess about 100 - 150 ohm depending on the transformer. (Rather strange advice in those pages. One should define continuity; also not sure why they chose that particular item to check for - nevertheless.)

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