SiliconRay Kits - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th February 2012, 02:32 AM   #11
diyAudio Member
 
Join Date: Nov 2007
Location: Dallas
I found some transformers locally that might serve to supply 6VAC and 250VDC.
After all, I don't have all that fancy Agilent stuff at home. I got a junk lab in my
kitchen, easily shamed by the poorest of labs anywhere in the world.

But I will remind what pro equipment did measure: Actual plate current was less
than 1mA (I was expecting like 3 to 5ma), and the lower grid was discovered to
bias itself far more negatively than ground. Captured electrons perhaps piling up
a bias on both grids with nowhere to go? I would strongly consider some leakier
resistor values for both grids. Even so, it works fine, sounds fine as-is.

The board looks great, almost as good as ours, and you wouldn't want to know
the price our shop could make a similar board. I could never afford for personal
use if I had to rely on my own people. Then again, our specialty is rediculously
short turns (like 5 days or less), fancy inspection and testing to fancy specs with
lots of industry certifications. For example, we just got this new 3D automated
X-Ray inspection machine. Like our old Xray wasn't good enough or something?
You have seen pics, the old machine rocked! But we need a 3D robot inspector
now, why??? This excess is why I could never get my own stuff done where I work.

That said, I didn't find anything wrong with Silicon Ray's board or parts.
I wish his fluxing had been a little more aggressive. Was little flow through
to the top side. I'll probably go over it once more with a water soluble. That
won't be an issue if you are getting a kit of parts. Your favorite solder and flux
and technique always assured when you DIY...

Last edited by kenpeter; 7th February 2012 at 02:56 AM.
  Reply With Quote
Old 7th February 2012, 04:04 AM   #12
diyAudio Member
 
Join Date: Sep 2011
schematic of the 6j4+6p6p preamplifier which was missing on the website. Pls let me know your thoughs.


Click the image to open in full size.

Thanks Kenpeters good words about us. A few more words about the PCB: the boards are UL proved and the factories are ISO certified although it takes only $50 to prototyping several 2L 4"x4" PCB at ezpcb. Unlike the tube kits are mostly for DIYer, the customers of PCB service have many big names such as TI, Micron, JPL, ROHM.. "ridiculous short turn" is also available, how about 24 hours for 2L? It's still effortable even plus 2 to 3 days DHL shipping.
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services
Chat with me
  Reply With Quote
Old 7th February 2012, 07:37 AM   #13
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
Siliconray.
In Europe the mains voltage is NOT 220 VAC. It is 230 V.
At present your products built with 220 V transformers do not comply with EU safety directives.
  Reply With Quote
Old 7th February 2012, 07:49 AM   #14
diyAudio Member
 
Join Date: Sep 2011
I know that the voltage is Europe is 230V. In australia it's 240V. But I think the performance of the amplifier won't be effect significantly by 5% difference. Sometimes the swing of power line is far beyond 10V.

About the safty, the transformer can endure at least 500V ESD between layers, so 230V isn't a problem at all.

Anyway, we will consider providing 240V version seriously if it's really necessary.
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services
Chat with me
  Reply With Quote
Old 7th February 2012, 08:52 AM   #15
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
This is not an issue how the amplifier performs, only what regulations require.
If you do not make any changes in transformers, change at least the voltage rating to 230VAC.
  Reply With Quote
Old 7th February 2012, 09:01 AM   #16
TV7 is offline TV7  Australia
diyAudio Member
 
TV7's Avatar
 
Join Date: Aug 2011
Location: Fraser Coast
Quote:
Originally Posted by siliconray View Post
I know that the voltage is Europe is 230V. In australia it's 240V. But I think the performance of the amplifier won't be effect significantly by 5% difference. Sometimes the swing of power line is far beyond 10V.

About the safty, the transformer can endure at least 500V ESD between layers, so 230V isn't a problem at all.

Anyway, we will consider providing 240V version seriously if it's really necessary.
Here's the funny thing, it used to be 240V but now the new standard is 230V as per AS. I am getting 250V at the end of the line at my place.....no wonder I keep blowing light bulbs.
  Reply With Quote
Old 7th February 2012, 09:08 AM   #17
diyAudio Member
 
Join Date: Sep 2011
Do I need to change the rating to 220V/230V AC? are there any other countries use 220V except China?

TV7, A custom in Australia told me his voltage is less than 210V in his farm which is far far away from city. It's better than 250V to blow the bulbs, right? After all he was very happy with the EL34 amplifier at that voltage.
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services
Chat with me
  Reply With Quote
Old 7th February 2012, 09:28 AM   #18
TV7 is offline TV7  Australia
diyAudio Member
 
TV7's Avatar
 
Join Date: Aug 2011
Location: Fraser Coast
Quote:
Originally Posted by siliconray View Post
Do I need to change the rating to 220V/230V AC? are there any other countries use 220V except China?

TV7, A custom in Australia told me his voltage is less than 210V in his farm which is far far away from city. It's better than 250V to blow the bulbs, right? After all he was very happy with the EL34 amplifier at that voltage.
That would probably be the first time I have heard of such a low voltage at the customer end even in a remote farm. Surprised he is not using a swer (single wire earth return) if it is that bad. (not sure if they are even legal any more, bloody greenies).

I'm not sure what China gets however my advice is to shoot for 230 volt system, making it legal for Australia and most of Europe easily. And if China is 10 volts less then it shouldn't be too big of a problem.........just remember if your amps are geared around 220 volts then the 6.3 filament will be putting out 7.15V when connected to my supply at 250 volts, as compared to 6.8 V if you shoot for a 230 V system. Assuming of course un-regulated filament supply.
  Reply With Quote
Old 7th February 2012, 12:19 PM   #19
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by siliconray
Pls let me know your thoughs.
What is it for? A voltage gain of 11 is too much for most systems.

Officially Europe is 230V. This is just a typical EU bureaucratic fudge. In the UK most of us still get somewhere around 240V. Elsewhere people generally get somewhere around 220V. Ideally your transformer needs a tap. Failing that, design for 230V and hope that your customers are not too far off this. Use a double-pole mains switch. Mains safety is one of the areas where Chinese electronics has a bad reputation, so you can set a new trend and show others how it should be done.
  Reply With Quote
Old 7th February 2012, 02:57 PM   #20
John L is offline John L  United States
diyAudio Member
 
John L's Avatar
 
Join Date: Oct 2001
Location: Cary NC
Quote:
Originally Posted by siliconray View Post
schematic of the 6j4+6p6p preamplifier which was missing on the website. Pls let me know your thoughs.


Click the image to open in full size.
Ray, it would be nice if I could get the schematic to download on to the page. The same thing is happening on the product page as well.

I'm curious as to why things are so hard to load.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Post your photos of Siliconray products siliconray Siliconray Online Electronics Store 18 3rd December 2012 09:06 AM
Introduction of Siliconray and it's forum on diyaudio siliconray Siliconray Online Electronics Store 3 22nd December 2011 04:18 PM
New vendor - Siliconray Jason Site Announcements 12 14th October 2011 04:22 PM
Audio channel on siliconray.com siliconray Vendor's Bazaar 1 1st October 2011 04:53 AM
Where to buy kits Or best SS kits Kitarist Solid State 1 8th February 2009 01:03 AM


New To Site? Need Help?

All times are GMT. The time now is 12:22 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2