[TenTec] Please help - value of capacitor in parallel with R58 on Argo 516 PA Board needed

Steve Ireland stevevk6vz at tpg.com.au
Tue Dec 1 03:19:50 EST 2020


A friend and I are trying to repair a TT Argonaut V 516 PA board. The fault seems now to lie with a small capacitor which is in parallel with R58 (470 ohms) on the PA board.  

This capacitor has gone open circuit but is not shown on the Ten Tec 516 PA board schematic!!! To make matters worse, on this particular capacitor, the value is indistinguishable, owing to fading.

The resistor and capacitor is part of the 3 times negative voltage generator, which generates -150V to ensure the PA low pass filters, apart from the one being used, are switched out of circuit.  

Please can anyone let me know what the value of this mysterious component is? Thank you!! 

Vy 73

Steve, VK6VZ (also G3ZZD)   

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From: Steve Ireland
Sent: Monday, 23 November 2020 12:42 PM
To: TenTec516 at groups.io
Subject: Please help - readable Ten Tec 516 schematics/manual needed to repair radio

G’day from Glen Forrest, Western Australia

In the process of trying to repair an TT Argonaut V 516, which has a power amplifier/power amplifier low pass filter fault.

My problem is the schematics of the downloadable Ten Tec Argonaut V manual available on the Ten Tec website are just about unreadable to me as a 65 year-old. 😉 

Please does anyone have a PDF – or know where I can get a PDF – of the manual/schematics which are complete/more readable than the TT download? 

Even better, if they can email it to me at stevevk6vz at tpg.com.au, it would be much appreciated.

Thank you!!!

Vy 73

Steve, VK6VZ/G3ZZD

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