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Old 9th December 2012, 01:27 AM   #3211
lhquam is offline lhquam  United States
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After seeing Tea-Bag's PCB layout, I was inspired to play around with another layout variation. This one is Jensen only and provides some additional options, such as lowered voltages to the drains of the input JFETs.
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Old 9th December 2012, 01:39 AM   #3212
qusp is offline qusp  Australia
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wouldnt it be better to allow for the Toshiba jfets to be mounted either back to back, or side by side to allow thermal bonding either with grease/silver epoxy or one of EUVL's trick little heatsinks?
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Old 9th December 2012, 02:01 AM   #3213
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Default F6
layout
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Old 9th December 2012, 02:16 AM   #3214
6L6 is offline 6L6  United States
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Quote:
Originally Posted by qusp View Post
wouldnt it be better to allow for the Toshiba jfets to be mounted either back to back, or side by side to allow thermal bonding either with grease/silver epoxy or one of EUVL's trick little heatsinks?
Face to face (flat to flat) allows them to be zip-tied together for thermal tracking.
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Old 9th December 2012, 02:40 AM   #3215
qusp is offline qusp  Australia
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Quote:
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Face to face (flat to flat) allows them to be zip-tied together for thermal tracking.
sorry I mispoke, thats what I mean, face to face not back to back...doh! for the thermal reasons you mention; but also Patrick's little heatsinks have them opposed, but side by side. neither of which can be used with the 2 layouts presented on this page
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Old 9th December 2012, 02:47 AM   #3216
6L6 is offline 6L6  United States
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Patrick's heatsinks have them side by side so a pair of J74 could be used instead of a J109, on the same pad. For good thermal tracking face to face would be the most logical in this project.
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Old 9th December 2012, 03:02 AM   #3217
lhquam is offline lhquam  United States
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Very nice. After a few tweaks I would definitely use it.

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Old 9th December 2012, 08:55 AM   #3218
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Very nice. After a few tweaks I would definitely use it.
Tell me please, what would you like to tweak? I'll try to implement it.
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Old 9th December 2012, 10:45 AM   #3219
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Very nice. After a few tweaks I would definitely use it.
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Old 9th December 2012, 11:09 AM   #3220
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or that one?
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