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Old 4th July 2013, 08:48 PM   #2251
6L6 is offline 6L6  United States
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Quote:
Originally Posted by Triodethom View Post
The many boxes of unobtanium transistor leads to an answer about the j74 from linear System I guess ?
Lots and lots of discontinued Toshibas -- all the desirable & rare stuff.
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Old 6th July 2013, 03:50 AM   #2252
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Hi All,

If I have dead quiet finish 1 channel F5T V2 (Experimental Build using non-official DIY Store Board) and a stable output DC offset, do I still need to bother for measuring nor looking for any Oscillation?

These are following exact component value per schematic.

Do I expect same result with the DIY Official board? Visualize that the only difference is the board layout. Currently, my non-official board is concentrated on a single big heatsink. When I use the DIY Store Board, going to mono...P and N Channel board will have each separate heat sink where the gain stage will be in the middle similar with the commercial Pass Amp.

Cheers.
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Old 6th July 2013, 03:56 AM   #2253
6L6 is offline 6L6  United States
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If it's working, it's not terminally oscillating...

Everything sounds like it's fine.

My bouts with oscillation had immediate effect and evidence in 1) smoked/burnt gate resistors, and 2) dead output mosfets.
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Old 6th July 2013, 04:10 AM   #2254
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Hi Jim,

Yes, I haven't experience 1 and 2 so far...burning the amp for 2 weeks already.

Still studying....and building confidence to go for the final build. Main stopper as of the moment is where to source out a huge heat sink suitable for much high bias.

Cheers.
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Old 6th July 2013, 04:16 AM   #2255
6L6 is offline 6L6  United States
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In the time being, use a fan.

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Old 8th July 2013, 04:15 PM   #2256
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Can someone point me to the thread that explains the star grounding method.
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Old 8th July 2013, 05:51 PM   #2257
WalterW is offline WalterW  Netherlands
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Can someone point me to the thread that explains the star grounding method.
This is a nice article:

Earthing (Grounding) Your Hi-Fi - Tricks and Techniques
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Old 8th July 2013, 06:52 PM   #2258
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Thanks Walter I will give that a read.
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Old 8th July 2013, 09:07 PM   #2259
Variac is offline Variac  United States
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We have this in the "Articles" area:
Audio Component Grounding and Interconnection
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Old 9th July 2013, 02:03 AM   #2260
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Man I guess if I just do a simple google search for star ground connections I get all I need to know, alot of info comes from this site. I think this is something that needs to be read up on to keep them nasty ground hums away, as this is one of biggest fears when I start to build.
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