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F5X -- the EUVL Approach - The Build Thread
F5X -- the EUVL Approach - The Build Thread
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Old 8th December 2016, 08:37 AM   #1021
AndrewT is offline AndrewT  Scotland
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If you can fit an equal number of Pchannel devices and Nchannel devices on a heatsink then OK.
If you fit all the Pchannel on one heatsink and all the Nchannel on the other heatsink then you are virtually guaranteed to have one hotter than the other. When the hot one has a lower Vds, it will start to cool and change over to eventually become the cooler one. During the changeover the output offset will change. I fear this swapping over of hot to cold could become unstable. And worse, what happens to the output offset if it does become unstable?
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Old 8th December 2016, 10:07 AM   #1022
EUVL is offline EUVL  Europe
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You can always join two heatsinks together with a 10mm aluminium backing plate covering th eentire area,
with lots of thermal compound in between, or even better aluminium solder.


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Old 10th December 2016, 07:03 AM   #1023
alazira is offline alazira  United States
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Quote:
Originally Posted by alazira View Post
Can anyone tell me the spacing for the diodes on the heatsink?

After discovering the quasimodo thread I am looking to snub the transformers as well as replacing the diodes. Pre-building the bridges (PTP) would reduce the time the amp is out of commission. Anyone snub the primrose tx with the quasimodo?
Well, I disassembled the amp only to find a different spacing/orientation than expected. The measurement is 16mm x 45mm, and the longer "B" lengths are in series instead of parallel.

Quasimodo snubbing findings for Sumr/primrose 600VA 2x15V:
with Cx=0.01uF, Cs=0.2uF
Rs= optimal somewhere between 15Ω and 20Ω

From left to right: Rs=1K, Rs=50Ω, Rs=25Ω, Rs=15Ω
Attached Images
File Type: jpg sumr600VA2x15 Rs1K.jpg (46.6 KB, 280 views)
File Type: jpg sumr600VA2x15 Rs50R.jpg (45.6 KB, 268 views)
File Type: jpg sumr600VA2x15 Rs25R.jpg (45.7 KB, 267 views)
File Type: jpg sumr600VA2x15 Rs15R.jpg (45.6 KB, 264 views)

Last edited by alazira; 10th December 2016 at 07:12 AM.
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Old 10th December 2016, 09:06 AM   #1024
AndrewT is offline AndrewT  Scotland
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Maybe Rsnub is a bit lower than 15r?
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Old 10th December 2016, 06:06 PM   #1025
alazira is offline alazira  United States
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Quote:
Originally Posted by AndrewT View Post
Maybe Rsnub is a bit lower than 15r?
I went down to 12Ω, but it looked overdone. I think 15Ω is safe.
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Old 13th January 2017, 01:56 PM   #1026
Markus is offline Markus  Germany
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Default One out of two amp units up and running

After countless hours of trying forth and back how to solve the integration puzzle the first of my twin amps is integrated, powered up and running.

Fitting a proper wiring into the tight design volume was a particuallar challenge. Those who are looking for wiring ideas may find my approach based on the very traditional technique of wire lacing interesting enough to give it a thought. No plastic cable ties, no glued-in tie bases, only PTFE wires and lacing cord.

Markus
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File Type: jpg P1190501.JPG (331.3 KB, 174 views)
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Old 13th January 2017, 02:00 PM   #1027
EUVL is offline EUVL  Europe
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Very nice.
Perfect German worksmanship.


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Old 13th January 2017, 06:32 PM   #1028
samoloko is online now samoloko  Bulgaria
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very well
what Is bias
which type Is regulator heatsink - look very big
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Old 14th January 2017, 08:57 AM   #1029
Markus is offline Markus  Germany
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Quote:
Originally Posted by samoloko View Post
what Is bias
which type Is regulator heatsink - look very big
Currently I am running the pwr FETs on 1.5A bias each in thermally settled state. The supply voltage I reduced to +/- 12V, hence the regulators are actually running in cap multiplier mode. SQ I still need to work on, something is odd. Its not close to what I remember from the various protos we build previously. It is the classical error of doing to many changes at once.
The point IŽd like to make is I have not found a setting yet which I can recommend.

As for regulators heat sinks. This is the standard size of the batch #2 GB, but this is different in size and shape compared to the batch #1.

Markus
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Old 14th January 2017, 09:12 AM   #1030
EUVL is offline EUVL  Europe
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Not true.
All batch 1 got a conversion kit which used the same heatsink.


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