New (to me) Threshold FET-10 HL (What to refurbish?) - Page 2 - diyAudio
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Old 10th June 2010, 02:50 PM   #11
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I've been using the FET-10/HL for the past year and half... it's my favorite linestage so far, supplanting my DIY 6N6P tube unit.

Gary B - thanks for the parts list as I've been looking to upgrade the power supply parts.

For phono, don't forget the companion FET-10/PC. It's the best I've heard so far... very natural and neutral.
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Old 10th June 2010, 04:31 PM   #12
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Quote:
Originally Posted by GaryB View Post
still fit the top panel.
There were flat oval-shaped axial polypropylene caps that could replace the standard 10uF green Ero Roederstein MKT1813 and yellow CDE caps of the FET-ten/hl without having to lift the rooftop.
Plenty of NOS places that might have some.
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Old 10th June 2010, 05:26 PM   #13
AMV8 is offline AMV8  United Kingdom
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Redwingnine
Your preamp looks great.
If you are updating the preamp then I think you will find the biggest change will come from replacing the volume control with a stepped attenuator using discrete resistors. I recommend the ladder type where each change in the attenuator uses just two resistors. I use 23 step attenuators. I have not found any carbon or plastic volume controls that can equal a ladder type attenuator. I think you will be surprised by the difference this makes.
Other than that you might improve the power suply - making the supply cleaner and better regulated. For your pre amp I think that using a power supply with a pass transistor on the positive and negative lines is sufficient ( As Nelson Pass uses on some of the Pass labs preamps ) A disc pre could use better regulation.
Please provide more pics as you update.
Don
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Old 11th June 2010, 12:13 AM   #14
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Quote:
Originally Posted by jacco vermeulen View Post
There were flat oval-shaped axial polypropylene caps that could replace the standard 10uF green Ero Roederstein MKT1813 and yellow CDE caps of the FET-ten/hl without having to lift the rooftop.
Plenty of NOS places that might have some.
Any brands, part numbers that you could suggest? My friend's unit had the green Ero Roederstein MKT1813 caps in it.
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Old 11th June 2010, 02:42 AM   #15
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Default Found some pictures !

Hi,
I found some pictures by Google !

There're many guy DIY this preamp so long time ago in Taiwan.
I hope we can modify ouput capacitor by use Panasonic Cap such as in Pass X0.2

Thanks
Anadigit
Attached Images
File Type: jpg Fet Ten Schematic.jpg (94.1 KB, 1143 views)
File Type: jpg Fet Ten Prototype.jpg (49.6 KB, 1075 views)
File Type: jpg Fet Ten TOP OVERLAY.jpg (71.0 KB, 1051 views)
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Old 11th June 2010, 02:49 AM   #16
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Default PCBs

Sorry I can't post Clone PCB layout here.
But I can send other pictures via email.

Thanks
Anadigit
Attached Images
File Type: jpg Fet ten PCB TOP.jpg (191.2 KB, 988 views)
File Type: jpg Fet Ten PCB BOTTOM.jpg (94.5 KB, 910 views)
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Old 11th June 2010, 10:08 AM   #17
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Quote:
Originally Posted by MashBill View Post
brands, part numbers
The Dearborn 731P series is an attractive option, body size of the 160Vdc type in 10uF is roughly 0.6" x 1.0".
Their 10uF oval 734G series may likely be too big.

Others : Paktron FPF, American caps VW2, Electrocube 935B series.
Cornell and Illinois cap manufacture ovals, but from 600Vdc and not in 10uF, too large anyway.
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Old 12th June 2010, 06:09 PM   #18
a.wayne is offline a.wayne  United States
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How is the FET9 vs the FET10 , well apart from having a phono stage ...
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Old 13th June 2010, 12:51 PM   #19
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Quote:
Originally Posted by a.wayne View Post
How is the FET9 vs the FET10 , well apart from having a phono stage ...
A phono and line stage in separate cases and an extra powersupply have better noise/separation numbers, theoretically.
The FET ten/hl, FET ten/pc, and FET nine were manufactured in the exact same period, no need to use other than the same line and phono circuits in the FET nine.

My favorite combo was the FET ten/e balanced inputs/outputs series, see attached pic for circuit details.
Biggy overhere : http://img380.imageshack.us/img380/4033/s6300714zx6.jpg

(the later Bladelius designed T2 preamp model is a totally different animal)
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File Type: jpg Fet-ten-e copy.jpg (89.8 KB, 580 views)
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Last edited by jacco vermeulen; 13th June 2010 at 12:56 PM.
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Old 13th June 2010, 06:50 PM   #20
a.wayne is offline a.wayne  United States
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Jacco thanks for the response...I have a fet 9E, i might now revive with new caps and give it another go.

regards...
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