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DIY FirstWatt F4 and McIntosh C48?
DIY FirstWatt F4 and McIntosh C48?
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Old 20th July 2016, 10:12 PM   #71
Rosewind is offline Rosewind  Denmark
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Another day at the office:
Checked the value of R8 and it was the correct one (22.1k) on both amp boards.
Drilled holes and mounted the soft start module on the back plate.
Slow but sweet:
https://1drv.ms/f/s!AuxF4gJ_6qu_xRVX4GEEh6kWhARn
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Old 2nd August 2016, 06:13 PM   #72
Rosewind is offline Rosewind  Denmark
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Have contact with an exprienced local DIY.-gentleman. I hope to learn a few tricks.

Also may have got myself a back-up power amp, an ESS 200 - a company I understand that Mr. Pass once worked for at the beginning of the 70s. However, Mr. Pass was probably busy learning his trade by building speakers / cross-overs. It would be one hell of a coincidence to have two "Nelson Pass amps" in my posession.
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Old 10th July 2017, 10:06 PM   #73
Rosewind is offline Rosewind  Denmark
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Default Back to the build: Pre = Ear 868L + Eastern Electric Minimax BBA bufffer

So, a long long time has passed with my F4 build gathering dust in a closet. Within a few days I will take delivery of an Eastern Electric MiniMax BBA buffer, so I don't think that there is any need to populate the BA2 board. Thus I can finish the build quite a lot sooner than expected. I will not need to solder at lot (which is a god thing, I believe).

For the testing I will have to have some help from local people, however.

My set-up has changed:
- I traded in the McIntosh C48 for an EAR 868L
- I will use a buffer pre (the Eastern Electric MiniMax BBA) between the 868L and the FirstWatt F4 to see how that works out.

I have been more tied up with work - teaching English - than expected, so now that I have a good five week stretch of holiday ahead of me, I will dust off the project and see if I can finish it before going back to work.
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Old 7th August 2017, 08:52 PM   #74
Rosewind is offline Rosewind  Denmark
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Another thought: will my EAR 868PL be able to swing enough volts and gain to use the F4 without the Buffer? Hmmm.
But really, I just need to place everything and wire them together as tidily as can be ssen in the F4 build guide. Then I will have to take the amp to someone who can help me test and adjust the power amp as I don't trust myself to do that properly.
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Old 7th August 2017, 09:54 PM   #75
Zen Mod is offline Zen Mod  Serbia
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DIY FirstWatt F4 and McIntosh C48?
so - you like sweeteners (BBA) ?

it's hard to have any objectivity speaking of that .........

BBA is redundant there ...... it's having nothing better than EAR , and few things worse

find gain figure of EAR , same as max. allowed signal , so we can start from there
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Old 7th August 2017, 09:58 PM   #76
Rosewind is offline Rosewind  Denmark
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Thanks!
I am in the process of selling the BBA. I will have to go look and see if I can find out what gain + voltage the 868PL can swing.
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Old 8th November 2017, 08:51 PM   #77
Rosewind is offline Rosewind  Denmark
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Default EAR 912 in the house

Alright. Lots have been going on here (yet not with the F4 FirstWatt build ...). I now have an EAR 912 in the house. I also bought a renovated Amcron / Crown D150 Series 2 power amp to tie me over since I am taking such long time getting on with my build of the F4 FirstWatt.

Next I am going to place a table in my study. On that, I will put my FirstWatt F4 build so I have eastư access to it on a daily basis. Until now I have had to put it away in a closet at the end of every build session. This way I can slowly get on with my build slowly but surely.

I will first try to finish the F4 build without the BA2 buffer in.

Last edited by Rosewind; 8th November 2017 at 08:55 PM.
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Old 8th November 2017, 09:35 PM   #78
xrk971 is online now xrk971  United States
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DIY FirstWatt F4 and McIntosh C48?
I just built a Preamp with Aksa specifically to be able to drive the F4 here:

AKSA's Lender Preamp with 40Vpp Output

It's really simple and sounds superb.
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Old 8th November 2017, 11:24 PM   #79
Rosewind is offline Rosewind  Denmark
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Thanks. I will see how it goes with what I have first.
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