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Old 20th December 2012, 02:07 PM   #41
6speed is offline 6speed  United States
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Quote:
Originally Posted by necplusultra View Post
anyone have the links to the 3 different tranformers?
Here's the Jensen --> JT-123-FLPCH
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Old 20th December 2012, 02:14 PM   #42
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cinemag: http://cinemag.biz/output/CMOQ-4.pdf
jensen: JT-123-FLPCH
onetics :???
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Old 20th December 2012, 02:20 PM   #43
Tea-Bag is offline Tea-Bag  United States
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For Onetics - one needs to PM BudP. There is no website. They mostly do OEM work.


I have asked Cinemag to tell me if they have issue sending out of US, and have asked them to be more responsive to these requests. A group buy is possible for these, but I dont think it would end up saving anyone money with double shipping and paypal charges etc.
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Old 20th December 2012, 02:29 PM   #44
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for the cinemag,

which one is prefered for f6?

CMOQ-4H or CMOQ-4L
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Old 20th December 2012, 05:12 PM   #45
Tea-Bag is offline Tea-Bag  United States
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I ordered the H or high nickel version. That doesn't necessarily mean it will sound any better than the 50 percent version - which is a closer match 'nickel-wise' to the Jensen.
To me these represent likely the least priced version.

I have built some boards that are almost complete that represent the "Unbuffered F6".
The main goal here is to start really evaluating listening of the transformers, without the ability to tweak anything else. I hope to have the whole thing wired into a listenable fashion in a few days. It's a busy time of year as we all know!

I contacted David at Cinemag - they are very behind in emails, as they have had some colds spreading around the company. He assured that they will get to all of them, and will ship anywhere legal to ship to using Fedex, DHL, post office UPS etc. So that should cover it.
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Old 20th December 2012, 05:17 PM   #46
Tea-Bag is offline Tea-Bag  United States
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Also note the Cinemags need to be specified with "PC PINS".
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Old 20th December 2012, 05:30 PM   #47
anilva is offline anilva  India
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Old 20th December 2012, 07:49 PM   #48
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Here is some pictures showing my implementation of the Unbuffered F6.
This shows all available jumpers, except now the Toshiba JFETs 2SK and 2SJ no longer need the source resistor spot jumpered.

To be specific, pots are jumpered to the middle pin towards the source resistor, the source resistor itself is jumpered, one led is jumpered, and the input is jumpered all the way to the input of the transformer, which is on the remote end of R11,12.
Attached Images
File Type: jpg F6Jumpers2.JPG (134.7 KB, 459 views)
File Type: jpg Jumper.JPG (94.3 KB, 440 views)
File Type: jpg JumperforUnbuffered2.JPG (118.5 KB, 435 views)
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Old 20th December 2012, 07:54 PM   #49
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Here is the proposed mouting for Universal Specification if you have one of the store chassis.
The FETs would go into red or blue postitions. If its in the blue , you can mount one set of standoffs in the green area direct to chassis.
Since the mounting on the blue taps will leave the board very close to the bottom of the chassis - I cannot guarantee that it fit there. We just made it under the limits of the proposed area.
If anyone already has these chassis, let me know - I can send you physical print out to measure against the actual chassis.
Attached Images
File Type: png UMS_for_f6.PNG (17.8 KB, 441 views)
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Last edited by Tea-Bag; 20th December 2012 at 08:04 PM.
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Old 20th December 2012, 11:13 PM   #50
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Hello, did a beautiful job.

He liked to ask some questions:

- Li behind which has a power of +- 37W in speaker 8ohms?
- With these changes is maintained in the 37W Class A (8ohms)?
- Do not want to use the 2SK/2J74 with IDSs larger than 8mA?

thank you
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