My TU8600 has degrading sound.

[Ken Tang]

Hi all,

I brought a 2nd-hand TU-8600 a few months ago. It has a pair of Psavne 300Bs and Golden lion pre-amp tubes. It sounded very sweet. Recently, its sound degrades after it is turned on for a few minutes. It becomes muddy. Do you guys have any idea what happens? Thanks in advance.

Regards,

Ken

 

[vkung]

DO YOU HAVE E OR R VERSION?

 

[Ken Tang]

Hi Victor,

I believe it is a E version.

Regards,

Ken

 

[vkung]

Check the PTC

 

[Ken Tang]

Thanks. But what is PTC?

 

[sesebe]

Thermistor - Wikipedia
PTC thermistor - Positive Temperature Coefficient >> Resistor Guide

 

[paczeltf]

Please note that Ken purchased a second hand unit and may not be familiar with the circuit.

Could a 8600 owner/builder please send him the part number and the position on the PCB, and also what exactly needs to be checked..?

 

[vkung]

It is easier to ship the main board to ELEKIT to check for you.
or if you can do it by yourself, I can walk you thru via what-apps.

 

[Ken Tang]

Thanks, any chance because the vaccum tubes are getting old?

 

[Ken Tang]

Check the PTC

Hi all,

I got a new set of PTCs from vkung. The clear sound is back after I replace them. Thanks all you.