[TenTec] Centurion Amp - early model, looking for advice

[Mike Bryce]

Watch out where you place your fingers inside that amplifier.

Not only will the voltages inside there kill you, it will hurt while you die

Be careful!

Mike, WB8VGE


Mike Bryce
prosolar at sssnet.com

“The trouble with quotes on the Internet is that you never  know if they are genuine”

—Abraham Lincoln







> On May 26, 2016, at 9:13 PM, Mike Schatzberg <cherokeehillfarm at earthlink.net> wrote:
> 
> Ok. Your tubes are not biased. This is not the way they would have built the amp. Depending on your meters accuracy, zero bias might allow 140 mils max. 
> 
> You have no cut off or operating bias. 
> 
> I don't have the road map for that amp, but it apparently uses an electronic bias switching with a transistor switch. Either the switch is bad or the bias source is bad.  I think it takes around 100 volts to cut off the 3-500, and only around 6 to 7 volts to run at 60 to 70 mils for two tubes. 
> 
> This is not very difficult to trouble shoot, but you need a fix not a mod. 
> 
> There are only a few diodes, maybe a zener, and a transistor to replace at most. 
> 
> 73,
> 
> Mike
> W2AJI 
>