Tandberg TR200 Noise Problem - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Dazmond · 13th Mar 2017, 6:59 pm

Something else that must be a clue - originally the fault was only audible when the mono switch was depressed and the amp was operating in full stereo, now it's there regardless of the switch position, other than adjusting the bias and removing components when needed to test them nothing has changed on the amp

Dazmond · 13th Mar 2017, 7:26 pm

Sorry I forgot to add - the bias current is 2.72ma on each channel.

Thanks,

Darren.

Dazmond · 16th Mar 2017, 7:36 pm

After much blood sweat and tears I finally managed to sort this, with the help of the good old analogue scope I found a leaky 180pf ceramic further up the stream - once replaced she's as sweet as a nut.

Many thanks Dave for taking your time to help me with this, I really appreciate it.

Darren.

jacob65 · 18th Mar 2017, 12:31 am

Congrats! Darren, which capacitor was it? Might try changing it it if I get a tr200 another time with same sort of problem.

Dazmond · 20th Mar 2017, 9:39 pm

Thank you very much! it was a test of my patience to say the least!

It was C513, still a bit of a head scratcher as to why but there you go! Quiet as a mouse now and sounds great

Thanks,

Darren.

13th Mar 2017, 6:59 pm	#21
Dazmond Hexode Join Date: Mar 2015 Location: York, North Yorkshire, UK. Posts: 254	Re: Tandberg TR200 Noise Problem Something else that must be a clue - originally the fault was only audible when the mono switch was depressed and the amp was operating in full stereo, now it's there regardless of the switch position, other than adjusting the bias and removing components when needed to test them nothing has changed on the amp __________________ Perfection is the enemy of the good...

13th Mar 2017, 7:26 pm	#22
Dazmond Hexode Join Date: Mar 2015 Location: York, North Yorkshire, UK. Posts: 254	Re: Tandberg TR200 Noise Problem Sorry I forgot to add - the bias current is 2.72ma on each channel. Thanks, Darren. __________________ Perfection is the enemy of the good...

16th Mar 2017, 7:36 pm	#23
Dazmond Hexode Join Date: Mar 2015 Location: York, North Yorkshire, UK. Posts: 254	Re: Tandberg TR200 Noise Problem After much blood sweat and tears I finally managed to sort this, with the help of the good old analogue scope I found a leaky 180pf ceramic further up the stream - once replaced she's as sweet as a nut. Many thanks Dave for taking your time to help me with this, I really appreciate it. Darren. __________________ Perfection is the enemy of the good...

18th Mar 2017, 12:31 am	#24
jacob65 Tetrode Join Date: Aug 2016 Location: Aalborg, Denmark Posts: 73	Re: Tandberg TR200 Noise Problem Congrats! Darren, which capacitor was it? Might try changing it it if I get a tr200 another time with same sort of problem.

20th Mar 2017, 9:39 pm	#25
Dazmond Hexode Join Date: Mar 2015 Location: York, North Yorkshire, UK. Posts: 254	Re: Tandberg TR200 Noise Problem Thank you very much! it was a test of my patience to say the least! It was C513, still a bit of a head scratcher as to why but there you go! Quiet as a mouse now and sounds great Thanks, Darren. __________________ Perfection is the enemy of the good...