I replaced them with unpolarized caps a while ago. Measure the bridge and get some unpolarized replacements 47uF 25V
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6.3VAC to 6.3VDC LDO supplies MIC5156 based tube amp upgrade
- Thread starter v4lve lover
- Start date
Thanks. I got you mixed up with another user it seems. My apologies. Thought you had left the forum.
https://www.diyaudio.com/community/...56-based-tube-amp-upgrade.382265/post-7515640
This post has virtually all the values.
I got some stuff from the local surplus store. You can use through hole resistors easily on the pads. Everything bog standard really.
You need the adjustable version of the mic https://nl.mouser.com/ProductDetail/998-MIC5156YN
If you are using the "through" hole version get this pot: https://secure.reichelt.nl/nl/nl/pr...den-staand-10-k-ohm-64y-10k-p2716.html?&nbc=1. The smd board cleverly allows "all types"
Heatsink: https://secure.reichelt.nl/nl/nl/ko...-sk-129-38-1-p228064.html?&trstct=pos_1&nbc=1
So sorry no bom.
This post has virtually all the values.
I got some stuff from the local surplus store. You can use through hole resistors easily on the pads. Everything bog standard really.
You need the adjustable version of the mic https://nl.mouser.com/ProductDetail/998-MIC5156YN
If you are using the "through" hole version get this pot: https://secure.reichelt.nl/nl/nl/pr...den-staand-10-k-ohm-64y-10k-p2716.html?&nbc=1. The smd board cleverly allows "all types"
Heatsink: https://secure.reichelt.nl/nl/nl/ko...-sk-129-38-1-p228064.html?&trstct=pos_1&nbc=1
So sorry no bom.
Swopping polarity will work as well. Swopped the polarity around on the boards I bought from you. And then there is 8 volt accross them with negative probe on negative pole and positive probe on positive pole.
if you can't find 47uF nonpolar then you can use two 100uF normal polarised electrolytics in series with their negative legs joined, per side.
Polarised work fine if connected the right way. Removed these. Shows that polarity is reversed.
Fixed.
ok
Im building a new batch of ten of these boards, Pm or leave a message here when interested, price €32.50 each excluding postage.
What rectifiers are you using?
Pictures might help to spot causes.
Pictures might help to spot causes.
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IRF840 is unsuitable, try IRL540
c1 and c2 are the wrong way around still. Check my post 87 and 88.
So the IRF840 is doing fine in this circuit? I have also purchased them for this board.
Will change to unpolarized.But it still working as it is.I think they are a part of a voltage doubler.
IRF840 is not reccomended, its got too high on resistance.
C1 and C2 change to unpolarized UVP series 100uF 25V
C1 and C2 change to unpolarized UVP series 100uF 25V