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Old 9th August 2012, 11:23 AM   #61
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Default Vishay GP02 HV Diodes

DigiKey has 3kV and 4kV PIV 250mA diodes:
GP02-40-E3/54 Vishay General Semiconductor | GP02-40-E3/54GITR-ND | DigiKey
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Old 9th August 2012, 11:36 AM   #62
john65b is offline john65b  United States
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There is a guy on flea-bay now selling the GP02-40 - tape of 100 for $11 + shipping.

I hope they are not fakes.
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Old 1st July 2016, 04:34 AM   #63
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Can someone show me a pic or a diagram of how to add additional diodes and caps to my mk 121 HV bias section. Do I need to drill additional holes in the board and hard wire the connections. Please give advice and pics if possible.
Thanks
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Old 1st July 2016, 12:01 PM   #64
tyu is offline tyu  United States
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Thank Jonn65b for this pic.......good luck
Attached Images
File Type: png Bias%20Mod[1].png (145.4 KB, 33 views)

Last edited by tyu; 1st July 2016 at 12:03 PM.
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Old 1st July 2016, 12:23 PM   #65
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So you just add that one 1 diode across the red and white wire without extra cap? That will increase voltage enough to get to 3.2k V.?
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Old 1st July 2016, 12:29 PM   #66
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Sorry I now see the cap thanks makes sense now and I believe the holes are already there. Did you notice the panels easier to drive after doing this? Thanks for the help.
Andrew
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Old 1st July 2016, 03:04 PM   #67
tyu is offline tyu  United States
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I have been running my bias high for years.....it opens up the sound....this year i pic up a pr of Acoustat 2+2s I ran them all stock ....with 5k bias that had just been rework with all new parts...for about 4 weeks..then I added the diode an cap....Wow....for me it a must...
I just cant live with the stock setup.... knowing what I was missing.....other may feel diff..
all just one mans finding....good luck
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Old 1st July 2016, 04:17 PM   #68
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Have you bypassed the speaker fuse block, and upgraded the HF caps ? Also using a 14 and 2 ohm resistor in the HF . It's more acuarate.


Thanks again for sharing I'm doing the mod right now with the extra step in the ladder.
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Old 1st July 2016, 06:01 PM   #69
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Soldered on the under side of the board where the traces are a diode going in proper orientation from the white tab from bias transformer to red wire from bias transformer , now do I solder a 3300 pf. Cap along side it from same wires (white and red) as diode? Want to make sure I understand.
Thanks Andrew
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