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Old 29th August 2008, 04:47 PM   #1
alexw88 is offline alexw88  Hong Kong
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Default my 6922 / E88CC preamp

Finished with my simple E88CC preamp, tested with JAN Philips, Siemens and Telefunken tubes. They do measure differently, with the Siemens having the lowest distortion.

I really love the E88CC Just want to share my work :

http://shine7.com/audio/6922_pre.htm



Click the image to open in full size.
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Old 29th August 2008, 05:36 PM   #2
SY is offline SY  United States
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Very neat and clean construction! Well done.
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Old 29th August 2008, 05:53 PM   #3
barossi is offline barossi  Germany
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Hi,

very nice indeed!
Where did you buy the PCB's?

KR

Hauke
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Old 29th August 2008, 06:45 PM   #4
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Where did you get the chassis/case? it's got a nice look.
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Old 30th August 2008, 12:43 AM   #5
alexw88 is offline alexw88  Hong Kong
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Thanks!

PCB is from a local DIY supply store in HK.

Chassis is from a Taiwan DIY site http://www.my3c.net/product/default.asp?gid=116

I think it would be difficult to order from them without knowing Chinese. You may try to email them : service@my3c.net
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Old 30th August 2008, 03:37 AM   #6
lineup is offline lineup  Sweden
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Cool 6922 E88CC 6DJ8

.
I like this one.
If I will make me one 250 Volt DC supply I try this!
As I recall these tubes also need heater Voltage/current
at like 6.0 - 6.3 Volt ...... DC or AC.
Is this correct?

Making one 250 VDC supply is not as difficult as we think.
It is most about find a suitable transformer
that outputs like 180 VAC .. or 2 x 90 VAC.

These can be found at almost any electronics internet shop.
At least I can get 230 VAC in ... 2 x 115 VAC out Trafo.
Need not be too big as the Current involved is not very high .....

I attach your schematic, if you do not mind.
I got it from your website:
http://shine7.com/audio/6922_pre.htm

regards lineup
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File Type: gif alexw88_pre-6922_sch.gif (5.0 KB, 2568 views)
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Old 30th August 2008, 05:45 AM   #7
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by alexw88


PCB is from a local DIY supply store in HK.

Buy some and put them on the market place at a reasonable cost.
There would be a lot of interest.
I would have a couple!!

Andy
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Old 30th August 2008, 10:54 AM   #8
SY is offline SY  United States
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I've seen those boards being sold already. Chinese vendor that people thought well of. Wish I could remember who...
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Old 30th August 2008, 11:03 AM   #9
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SY and his memory

quoting from the thread
My 12AX7 zero negative feedback preamp, with measurement

Quote:
SY, if you ever make it to HongKong you have to visit the store where I saw those solder stands. Bush Electronic Supply, in an alley behind a pretty big street in Hong Kong central or the Centre. You enter the alley, then walk up some steps and you enter the shop. Amazing, the contrast. http://hktubeaudio.homestead.com/files/Central_tube.htm Daan
Quote:
similar PCB is available on E-Scam http://cgi.ebay.com/MULTI-PURPOSE-T...7QQcmdZViewItem not associated with the seller.
a more up to date link
http://cgi.ebay.com/MULTI-PURPOSE-TU...2em118Q2el1247

Quote:
Since there are interest in these, here is a close up photo : I bought them from : Sound Explorer Company 凱韻音响電*公司 Flat A, 7/F., Hamilton Comm. Bldg., 558-560 Nathan Road, Kowloon Phone : +852 2332 1821 If you have a chance to pass by HK, buy some
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Old 30th August 2008, 11:11 AM   #10
alexw88 is offline alexw88  Hong Kong
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Don't understand why there is so much interest for that PCB, is that because of the color and look?

How about paint your standard prototype board for the look and feel you like? Here is what I did :

Click the image to open in full size.

Noticed the top small prototype PCB was originally standard green color, I painted it black to match the other PCB.
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