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F5 Turbo Builders Thread
F5 Turbo Builders Thread
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Old 13th February 2019, 01:50 PM   #5371
BigE is offline BigE  Canada
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What brand of source resistors are most people using for their builds? I used MPC74 last time, and need more. I'm not keen on their construction.

Has anyone tried Non-inductive wire-wound? Any suggestions?

Thanks!
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Old 13th February 2019, 02:03 PM   #5372
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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F5 Turbo Builders Thread
There is not such a thing as non inductive wirewound. Maybe less than other but that is all.

I recommend Mills only.
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Old 13th February 2019, 03:43 PM   #5373
Blitz is offline Blitz  Germany
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Well... there are many good sounding ww, tyco er-series as an example like er74 etc. Mills are very vibrant, bright, a bit technical... and there are many different versions.. ns, rs, grey, brown enamel...
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Old 13th February 2019, 05:22 PM   #5374
Bfpca is offline Bfpca  Canada
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F5 Turbo Builders Thread
I used what Mr Pass had specified. The way I look at it Pass amps are pretty much the top tier for sound quality and if Mr Pass recommends parts then they will sound fine. We are all free to experiment, of course, but I just don’t have the time or funds to experiment with resistor types and simply use what is recommended by the designer.
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Old 13th February 2019, 06:03 PM   #5375
Itsmee is offline Itsmee  England
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F5 Turbo Builders Thread
Panasonic ERX are nice
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Old 13th February 2019, 06:30 PM   #5376
6L6 is online now 6L6  United States
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F5 Turbo Builders Thread
If his amplifier is quiet when the inputs are shorted, it’s a ground loop, not anything to do with resistor brand.
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Old 13th February 2019, 07:20 PM   #5377
TheNuge is offline TheNuge  Germany
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Quote:
Originally Posted by 6L6 View Post
Please pose some in-focus, well-lit photos, particularly of the wiring.
Hi,
was away for work, but here goes!
BTW., I just realized that I posted in the Turbo thread, but have actually built regular F5s.... should I move the posting or re-post elsewhere?
Here's a pic of amp #1:
Click the image to open in full size.


On Amp #2 I tried attaching the speaker negative wires directly to the PSU ground. The function ground is de-coupled from chassis ground with a CL-60 thermistor.
Should I try making a true star-ground, where all the negatives "feed off" from?


Cheers


Es
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Old 13th February 2019, 07:28 PM   #5378
Itsmee is offline Itsmee  England
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F5 Turbo Builders Thread
The earth wire on the transformer bolt - have you created a 'shorted turn' or is that an electrostatic screen?
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Old 13th February 2019, 07:35 PM   #5379
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by 6L6 View Post
...not anything to do with resistor brand.
Maybe i should have quoted

Quote:
Originally Posted by BigE View Post
...I used MPC74 last time, and need more. I'm not keen on their construction... ...Any suggestions?
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Old 13th February 2019, 08:19 PM   #5380
TheNuge is offline TheNuge  Germany
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Quote:
Originally Posted by Itsmee View Post
The earth wire on the transformer bolt - have you created a 'shorted turn' or is that an electrostatic screen?
It's a screen - at least I think so...


Cheers
Es
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