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F6 Illustrated Build Guide
F6 Illustrated Build Guide
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Old 7th December 2017, 04:27 PM   #1001
Alistair72 is offline Alistair72  United Kingdom
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Quote:
Originally Posted by Zen Mod View Post
most likely just new mosfets

check source reistors , just in case
Thanks Zen.

Best get ordering.
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Old 9th January 2018, 10:27 PM   #1002
Patjr is offline Patjr
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Default Another F6 Completed

This is my first post (ever), and the F6 is my first DIY amplifier apart from a Bottlehead Crack some years ago. I would not have attempted this build without the clear instructions and pictures in this excellent guide. Manythanks to 6L6.
It all went exactly to plan. I used 5.6v Zeners and changed R7/8to 4.7K. Everything else is as per this guide. It must be said that having an assembly of unfamiliar parts come to life for the first time after tentatively adjusting some voltages, was a thrill not experienced since my youth (a verylong time ago), and happily, all without injury or release of magic smoke.
Some pictures are attached (Ihope) for proof of build. Chassis is mine, all aluminium, using Conradheatsinks. I went to a bit of effort to make it as integral as possible to increase thermal mass and surface area without increasing chassis size. Seems to work well with bias set at .59v
The build had a standard PSU at first because I was not game to deviate from basic instructions.
But I have since made it dual mono in preparation to try the F4 amp (yup, itís true, you just canít build oneof these things once you start). In fact I have just completed the BA3 pre-ampwhile waiting for the F4 parts to arrive (very bitten by this bug).
Thanks to Nelson Pass for sharing his art, to 6L6 for his work onthese guides and to ZM for his knowledge and humour along the way, and to allthose who contribute to this great DIY site.
Attached Images
File Type: jpg Chassis front.jpg (311.5 KB, 235 views)
File Type: jpg Chassis Rear.jpg (889.8 KB, 236 views)
File Type: jpg Chassis Internal.jpg (633.1 KB, 228 views)
File Type: jpg Original layout.jpg (476.2 KB, 226 views)
File Type: jpg Original single PSU.jpg (628.0 KB, 223 views)
File Type: jpg Above view.jpg (352.5 KB, 150 views)
File Type: jpg Front above view.jpg (860.4 KB, 145 views)
File Type: jpg Dual Mono.jpg (906.1 KB, 143 views)
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Old 9th January 2018, 10:51 PM   #1003
Zen Mod is offline Zen Mod  Serbia
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F6 Illustrated Build Guide
Fugly!

(hope these NTCs in plastic terminal blocks aren't those in mains ......... they're hot and , last time I checked , PTFE cased terminal blocks weren't black .........

so , to avoid your woman wearing black , use black Bakelite terminal blocks for mains NTC ...... and pull them away from metal around)
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Old 9th January 2018, 10:54 PM   #1004
JSA1971 is offline JSA1971  Canada
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Wow! Nice Work! What did you use to mount your transformers vertically?
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Old 9th January 2018, 11:18 PM   #1005
ichiban is offline ichiban  United States
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Very nice!

Where did you source the case from?

Is this the MosFet version or Semi-South?
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Old 9th January 2018, 11:36 PM   #1006
Patjr is offline Patjr
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Thanks Zen Mod. A little unnerving to read that. I guess posting at intervals during the progress of the build would have pick it up earlier. I'll change them before the amp goes back into use.
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Old 9th January 2018, 11:46 PM   #1007
Patjr is offline Patjr
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Quote:
Originally Posted by JSA1971 View Post
Wow! Nice Work! What did you use to mount your transformers vertically?


Thanks JSA1971. It's 6mm aluminium angle. Actually cut from some heavy channel to get the size I wanted.
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Old 10th January 2018, 12:00 AM   #1008
jameshillj is offline jameshillj  Australia
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Where did you get the top perforated plate?

And if those are the basic GB block bridges, suggest you get a pair of those fancy Schottky ones - they're not cheap but make quite a difference to the sound - not kidding!

Perhaps add a simple mesh cover over those mains NTC assembly (to avoid possible later accidents) and maybe consider a dc trap if you have 'dirty' mains supply.

Nice build - lots of attention to details - neat and practical job on the supply
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Old 10th January 2018, 12:10 AM   #1009
Zen Mod is offline Zen Mod  Serbia
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well , no mesh cover will replace thorough care and attention , when working on live amp

there are few more places with exposed mains and it's major PITA to cover them all

in last few years |I'm using small screwdriver completelly covered with insulation (nothing fancy - plastic handle , heatshrink on stub) with just tip exposed

do not ask how I come to that

and that's pretty much sole thing , besides meter probe (if possible - just one in hand , other crocodiled to appropriate point) I'm taking inside live gadget
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Old 10th January 2018, 01:37 AM   #1010
drpro is offline drpro  United States
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Best advice an old ham gave me, was when you are poking around in higher voltages than a D cell, keep one hand in your pocket.
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