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DIY Sony VFET pt 1
DIY Sony VFET pt 1
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Old Today, 05:55 AM   #731
PKI is offline PKI  United States
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DIY Sony VFET pt 1
While waiting for my chassis to arrive just keep entertaining myself with different thought. I do not know much about transformers, but I see that there are transformers 5x time the price of the edcore, do they bring some improvements? This: https://www.jensen-transformers.com/...Data-Sheet.pdf

Or it is a wrong one?
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Old Today, 06:32 AM   #732
noelectrix is offline noelectrix  Europe
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Jensen is used in F6 for example.
For the Edcor, do I remember wrongly, it obviously won the listening tests when used in M2 circuit ; ), so itīs not only about specs...
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Old Today, 09:42 AM   #733
coolnose is online now coolnose  Europe
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Nelson talks about the transformer choice at BAF, not sure what year exactly, but I watch them all once again from time to time.
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Old Today, 10:48 AM   #734
Zen Mod is offline Zen Mod  Serbia
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DIY Sony VFET pt 1
just to remind you that Edcor 600:15K used in pure galvanic isolation mode

if looking for any other xformer, take care of choosing xformer with same nominal impedances
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Old Today, 06:34 PM   #735
coolnose is online now coolnose  Europe
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FYI, It seems we do also have "prototype"/earlier revision (at least 1 pair) input boards over in the building thread.

DIY Sony VFET Builders thread

Last edited by coolnose; Today at 06:44 PM.
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Old Today, 07:20 PM   #736
Nelson Pass is offline Nelson Pass  United States
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DIY Sony VFET pt 1
Fortunately not an issue. The R7 ground to chassis is redundant to the 5 ohm
power thermistor to chassis.
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Old Today, 08:11 PM   #737
coolnose is online now coolnose  Europe
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Nelson, I didn't intend to sound "cocky", I just wanted you to be able to intervene before hell breaks loose....
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Old Today, 08:37 PM   #738
alazira is online now alazira  United States
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Big thanks to Nelson Pass for this gift of a project. I also really enjoy certain contributors to this thread for their entertaining literary comments. From the ongoing “Does it drive F4?” to “Audio Nervosa” (NP), “Greedy Boys” (ZM) and especially Mark Johnson’s deliciously wicked musings. Cadmium Yellow! I’m chuckling even though I read that days ago. Sort of like burping an hour after an epic meal, the feint aroma and taste allow you to relive it.

On to the reason for my post. This greedy-boy, who suffers from audio nervosa was wondering what the minimum voltage rating is for C2 (the DC blocking cap between jFets and Ecdor) on the Front End? I’d like to use a Silmic II there.

Second, compared to the schematic on pg5 of the article, the pcb has switched the positions of R1 and C1. If C1 blocks incoming DC, is R5 (“bleeds DC to prevent thumps”) needed?
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Old Today, 08:41 PM   #739
Zen Mod is offline Zen Mod  Serbia
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DIY Sony VFET pt 1
16V will do

in fact, no - you need 100V there

send all useless caps with lesser voltage to OPLDF

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Old Today, 09:29 PM   #740
william2001 is offline william2001  United States
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DIY Sony VFET pt 1
Quote:
Originally Posted by Nelson Pass View Post
Fortunately not an issue. The R7 ground to chassis is redundant to the 5 ohm
power thermistor to chassis.
Send all complaints to the Department of Redundancy department.
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