Building an F5 Turbo v2 (in-Progress) - Page 13 - diyAudio
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Old 2nd May 2013, 11:01 AM   #121
emyeuoi is offline emyeuoi  Italy
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Take long time but at the end I can attach the pictures.

One is the F5 (red) and one is the F5T V3 (blu).

Cheers,

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Originally Posted by emyeuoi View Post
Hi to everybody on DIYAudio.
Is long time (I can say years) that I follow this forum and finally I decide to put myself on the game.
I enjoy build ampli from long time, my first ampli was a 20W in classA for car publicated by Bartolomeo Aloia. Was amazing ampli and I built 3 of them with the electronic crossover.
Coming back from the past and stopping to boring all of you...Reading almost all the threats of the PASS forum finally I decide to built a Pass ClassA. Is a hard decision because my work take me around in the word and now I am in Korea that actually is not a good place if you want to be a DIYer. Very nice people but nobody speak english and all the website (digikey and mouser included) are in korean. No way to found a part shop here in Ulsan and I get the address in Seoul (thanks DUG!) but still I don't get the chance to go there (500 km from here).
Reading the guide built of Salomon I contact him for the PCB and he suggest me to look on Jims Audio in ebay. Now I have 2 channels of F5, 2 channels of F5T v3 and 2 channels of AlepX that look very nice
Received the V3 PCB I ordered the 5U 400 chassis from HIFI2000 that look very big and nice but reading this threat I understand that the V3 stereo in one chassis is not the best chance so I thinking come back in V2 using the PCB of V3. The picture of the board is attached. I check the PCB and look exactly as per NP schematic.
Somebody have used already this PCB? I think that can be easly used for the V2 bypassing the cascode and installing 2pr instead of 4pr.

I understand that Buzzforb have a GB for the trasformers and also can provide the Mosfet. May I ask to be part of the GB or is too late?

Any suggestion is of course most welcome!

Thanks to all of you

PS: I mention the picture of PCB... sorry, I will post when I understand how can do...
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Old 3rd May 2013, 12:19 AM   #122
Rixsta is offline Rixsta  United Kingdom
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I'm thinking of having the diyaudio ouput boards and the gain stage boards close together on the heatsink to keep wire lengths minimal is this a good idea?
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Old 3rd May 2013, 12:42 AM   #123
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yes it is. if your building a V2 stereo amp, you can mount the gain stage board in the midle of the sink(s) and 1 output board on each side.
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Old 3rd May 2013, 01:02 AM   #124
6L6 is offline 6L6  United States
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Yes.
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Old 3rd May 2013, 02:29 PM   #125
Rixsta is offline Rixsta  United Kingdom
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Lovely thanks. I don't trust long wires on the gate connections! Also c1 and c2 on gain boards are needed? I ordered 4 caps and put them on op boards as c1 but then i saw pics on here showing caps on gain board. The 1nf caps ive put on too.
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Old 23rd May 2013, 01:18 PM   #126
Rixsta is offline Rixsta  United Kingdom
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Hi, 6L6

I was wondering what the reason is for cable tying together the, 2sk170 and 2sj74 ?

also still not sure about C1 and C2. looks like C1 on gain stage is the same thing as having C1 on the OP boards.

and if i added to both id end up with 20uf which isn't right.
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Old 23rd May 2013, 01:28 PM   #127
AndrewT is online now AndrewT  Scotland
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Thermal coupling.
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Old 23rd May 2013, 02:16 PM   #128
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the cap on the output is just local filtering. You may not even need it. Thermal coupling is a diyers tweak. The Pass Labs products do not have it. since moving away from the 109/369 combo, based on what i have seen in pics. It will not make you like or dislike the amp and most likely will not affect its performance in a significant way, especially considering the f5T has thermal compensation and no offset issues to speak of.
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Old 24th May 2013, 07:39 AM   #129
AndrewT is online now AndrewT  Scotland
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Buzz,
the DC offset of the input pair is very senstive to the temperature difference across the input pair.
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Old 24th May 2013, 06:10 PM   #130
Rixsta is offline Rixsta  United Kingdom
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Thankyou very much! We are building the amp now its gonna be a beast!
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