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F6 Illustrated Build Guide
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Old 23rd May 2020, 09:40 AM   #1981
rollingtube is offline rollingtube  Germany
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Join Date: Sep 2010
Hi James, the washers that you see in my pics are actually from the back panel parts kit from the diyaudiostore.

I wouldn‘t overengineer this, I think I saw similar simple washers (that‘s what they are) in one of the hardware section of a local home improvement store recently. If the store and the HW section is large enough, then they should also have stock of such unusual washer sizes.
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Old 23rd May 2020, 09:59 AM   #1982
ColinA123 is offline ColinA123  United Kingdom
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Join Date: Jun 2017
Location: Shropshire
Those are "penny washers"
Like these. A2 Stainless Steel Penny Repair Flat Washers M3 M4 M5 M6 M8 M10 M12 M14 M16 M20 | eBay
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Old 23rd May 2020, 01:35 PM   #1983
jameshillj is offline jameshillj  Australia
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Join Date: Feb 2005
Location: Melbourne
Thanks guys, much appreciated, especially finding them on eBay! And yes, I do tend to get a bit 'anal' about some of the details - it's a 'sort-of' challenge, or a puzzle! (I think there's a name for people like me!)

I did find a couple of different types of spring tension washers suitable for an M3 screw on the net (fitted between the screw head and the large 'penny washers') and am a bit undecided about the pressure to apply to the transistors - there seems to be a range between 2.5lbs and 7lbs - I've only looked at McMasters Carr and the MSC company - quite a range.

The transistor clips I've used apply are specified at 60N (about 10lbs) but I think it's a lot less in practice.

Working on Salas's L-Adapter to drive the F6 amp, biased to about 1.7A - going a bit overboard but ...
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Old 23rd May 2020, 01:46 PM   #1984
TungstenAudio is offline TungstenAudio  United States
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Join Date: Jan 2014
Location: Kenmore, WA
Something else to consider is using a torque screwdriver to get reliable and consistent torque on the M3 screws which attach the Mosfets to the heat sink. They aren't cheap, but are a good investment.
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Old 23rd May 2020, 02:40 PM   #1985
ColinA123 is offline ColinA123  United Kingdom
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Quote:
Originally Posted by TungstenAudio View Post
Something else to consider is using a torque screwdriver to get reliable and consistent torque on the M3 screws which attach the Mosfets to the heat sink. They aren't cheap, but are a good investment.
But what torque sounds best?
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Old 23rd May 2020, 07:59 PM   #1986
Yaho is offline Yaho  United States
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Quote:
Something else to consider is using a torque screwdriver
Something I've never considered. For tubes, I just have to push them in tight and wiggle a little. What would be an ideal torque?
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Old 23rd May 2020, 09:00 PM   #1987
TungstenAudio is offline TungstenAudio  United States
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I use 8 in-lb mounting torque. Max is usually 10 in-lb. The datasheet will have this in the Maximum Ratings section.
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Old 23rd May 2020, 11:13 PM   #1988
Yaho is offline Yaho  United States
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Quote:
The datasheet will have this in the Maximum Ratings section
And the date sheet says, Mounting 6-32 or M3 screw Torque 10 lb
I had no idea. I learned a new thing. Thanks so much!
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