UPGRADED C-13 AND C-14 GET VERY HOT, tubes4hifi low gain board. Is this a normal situation? I have noticed some gritty low level noise in both speakers when music is not playing. This noise is present with shorting plugs installed in imput jacks. Was thinking there may be a problem with the power supply.
3 posters
UPGRADED C-13 AND C-14 GET VERY HOT
detoxer- Posts : 10
Join date : 2011-08-17
Roy Mottram- Admin
- Posts : 1838
Join date : 2008-11-30
did you get those from Roy or Bob? are they 400v or 450v, and what capacitance? 100 or 120uF?
just let me know and we'll replace them for you
just let me know and we'll replace them for you
detoxer- Posts : 10
Join date : 2011-08-17
Got these from Bob with the purchase of an st70 this past year, not sure of the size, will look tonight and post. The unit functions fine except for the gritty buzzing in both speakers at very low volume or with no input. Again the two caps get warm to the point that I can't keep my calussed finger on them for more than two seconds. Is this likley to cause this buzzing.
detoxer- Posts : 10
Join date : 2011-08-17
The caps are 120UF 450volt
Sal- Posts : 221
Join date : 2009-02-05
Location : Central New Jersey Dynaco-ST70.com
Did you reverse the polarity of the capacitors?
Sal
Sal
detoxer- Posts : 10
Join date : 2011-08-17
No, unit has always functioned well, just recently noticed this problem.
Sal- Posts : 221
Join date : 2009-02-05
Location : Central New Jersey Dynaco-ST70.com
OK, I read your post wrong, I thought you just "upgraded" C13 and C14...
Sal
Sal
detoxer- Posts : 10
Join date : 2011-08-17
Well it turns out that the center tube was not making good contact. With the amp on I was able to stop the noise by touching the center tube with my finger. I sprayed contacts with deoxit and all is well again. I'd like to thank Bob Latino for his insight in helping me resolve this issue, Bob has also assured me that C-13 and C-14 will normally run warm without concern. This tubes4hifi st70 has done nothing but please me since day one. I have had dealings with both Bob and Roy and can't say enough good things about them.