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Old 26th June 2013, 01:14 PM   #2161
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Buy a PSU board from TeaBag. Simplify the PSU section, eliminating most of your internal wiring and complication. I have used this exact setup that I am recommending and it is no harder than an F5 to build. You must also make sure you haev valid components. This may have been discussed, but needs to be reiterated. I would only buy Jfets from one source. Spencer. Output fets are easier to come by and should not be a problem. You can do this, i tihnk you are just overcomplicating the process with the custom PSU, which also makes it difficult to help,as we are not working with a known standard.
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Old 26th June 2013, 01:16 PM   #2162
billyk is offline billyk  United States
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2nd the motion on the Teabag PSU board.
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Old 26th June 2013, 01:18 PM   #2163
6L6 is offline 6L6  United States
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I agree as well - get the PCB and carry on.
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Old 26th June 2013, 02:48 PM   #2164
Variac is offline Variac  United States
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It does look good. We really like the way you have the gain board between the output boards and are hoping to have holes in the new boards that will allow us to make that easy for those with the pre-drilled (UMS) heatsinks to do the same.


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Considering im no electrician but that its just a fun hobby I think I Did pretty well
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Old 26th June 2013, 10:31 PM   #2165
Rixsta is offline Rixsta  United Kingdom
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Cheers, well Ive been offered more money possibly will continue
So Im trying to find where those PSU boards are, guess ill message him direct.

BTW : when the amp blew i turned it on once and heard a tightening sound, then turned it off then back on same tightening sound then it sounded like it just snapped and saw some smoke, not on resistors anywhere it seems but from the Mosfets which all 4 seem dead in one go.

I understand you can tell whats going on better if Im using those Tea bags boards, cheers
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Old 30th June 2013, 06:45 AM   #2166
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Would like to inquire what is the normal DC offset for F5T V2 at speaker terminal at cold start?

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Old 30th June 2013, 09:06 AM   #2167
AndrewT is offline AndrewT  Scotland
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different from the fully warmed up offset !
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Old 30th June 2013, 11:02 AM   #2168
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The amp would be idle overnight then upon turning on the power button (via soft start), what DC offset voltage max is expected?
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Old 30th June 2013, 11:38 AM   #2169
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Is it causing a problem?
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Old 30th June 2013, 12:21 PM   #2170
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Hi Buzz,

I dont know if its a problem. Still on experimental mode.

Turn On - I have about 50mv DC offset then after awhile it will drop to 30mv then after 5 to 10min will be stable on +/-1mv.

Turn off - I will have a DC offset swing of about 400mv at the speaker terminal.

Im using jfets from Spencer at 7.3ma. Im not yet using the FETS from yours.
My bad, I was not able to buy some extra Fets from you for experiment purposes.

Just trying to understand first the behavior at the terminal that will not damage my speaker in future.

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