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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 4th April 2017, 01:31 PM   #141
PJN is offline PJN  United States
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Looks like the store is out, I guess I'll have to cannibalize a B3 build I was putting together.
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Old 5th April 2017, 09:17 PM   #142
noviygera is offline noviygera  United States
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Amplifier chassis question:
would this be a good or bad idea?
1.moving transformer into separate chassis, keeping away from the amplifier.
2.making the amp chassis from non metal material (aside from heat-sinks) to improve vibration control and remove electrical/magnetic interaction between chassis and circuitry

thanks,
Herman
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Old 7th April 2017, 01:19 AM   #143
wineds is offline wineds  Australia
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Does anybody know what the hole size is for the main PCB for O+, O-, V+, V-, In+, In- etc? I want to try and find some PCB pins for these holes to save wear and tear on them in the case of desoldering.
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Old 7th April 2017, 06:21 AM   #144
wineds is offline wineds  Australia
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Could I use something like this : http://au.mouser.com/ProductDetail/T...YUam7ntHZ5g%3d ?
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Old 7th April 2017, 10:52 AM   #145
wdecho is offline wdecho  United States
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Quote:
Originally Posted by noviygera View Post
Amplifier chassis question:
would this be a good or bad idea?
1.moving transformer into separate chassis, keeping away from the amplifier.
2.making the amp chassis from non metal material (aside from heat-sinks) to improve vibration control and remove electrical/magnetic interaction between chassis and circuitry

thanks,
Herman

#1 Always desirable but I doubt necessary with this build.

#2 Not really sure but I doubt necessary with this build

The store 4U chassis is more than adequate for this amplifier.
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Old 7th April 2017, 10:54 AM   #146
wdecho is offline wdecho  United States
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Quote:
Originally Posted by wineds View Post
Could I use something like this : http://au.mouser.com/ProductDetail/T...YUam7ntHZ5g%3d ?
Are you going to order 10,000 the minimum order? Desoldering is not that big a deal with soldering wick. Any connector of any type is a source of trouble one day. Solder.

Last edited by wdecho; 7th April 2017 at 10:57 AM.
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Old 7th April 2017, 11:39 PM   #147
wineds is offline wineds  Australia
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Quote:
Originally Posted by wdecho View Post
Are you going to order 10,000 the minimum order? Desoldering is not that big a deal with soldering wick. Any connector of any type is a source of trouble one day. Solder.
That was just an example. Plenty of low quantity options here to suit a range of hole sizes :

http://au.element14.com/webapp/wcs/s...4786,111854787

And you can also solder to them. In any case I guess only Nelson knows the PCB hole size.
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Old 8th April 2017, 12:54 AM   #148
grimberg is offline grimberg  United States
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Quote:
Originally Posted by wineds View Post
That was just an example. Plenty of low quantity options here to suit a range of hole sizes :

http://au.element14.com/webapp/wcs/s...4786,111854787

And you can also solder to them. In any case I guess only Nelson knows the PCB hole size.
Not only Nelson, every one who bought the PCBs and have already received them.

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Old 8th April 2017, 02:01 AM   #149
wdecho is offline wdecho  United States
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I tried to measure with calipers, approximately .064 inch.
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Old 8th April 2017, 02:03 AM   #150
BDP is online now BDP  United States
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Quote:
Originally Posted by PJN View Post
Ok, it looks like it is the front end. I played music through it and took voltage measurements at the RCA jacks and at G-T18 on both channels I got ~100mVac at the input jacks on both channels, on the good channel G-T18 was about 400 mVac and jumping around. On the bad channel I got 0 mVac. It looks like I need to pull the JFETS. Thanks
Your DC values look good. Double check your R1 thru R4 resistor values. Can you measure the AC value at the gates of the input jfets, to make sure signal is getting to Q1 and Q2.
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