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Old 21st July 2013, 08:32 PM   #461
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Thanks David! :-D
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Old 9th October 2013, 04:06 PM   #462
spurlte is offline spurlte  United States
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A New kind of heat sinks

Starting to build my first F5 Turbo V3 Number 87 Copper plates, tubing, radiator, and fans contraption.
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Old 18th October 2013, 01:02 PM   #463
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Default board wiring

Hi Guys,
Can you help me please, the wiring of the boards I have a few questions, 1. how many earths are there I see the one from the signal in is there more?
2. the outputs am I right in thinking main board L/R outs to output board PNP and NPN then are output boards linked then to speaker out?
3.does speaker in go direct to the star earth?
4.At what point on which board did you feed the V +/- into?
5. I am using the 1N5309 for D5 and 6 am I right in thinking a link is required for this with the LM334 marked but not fitted?

Hope you can clarify guys may sound simple to some but I just want to get it right.

Thanks
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Old 18th October 2013, 01:52 PM   #464
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I have one of the original very early 1980 Krell KSA 100's - the heatsink is somewhat undersized and all of the output stages have had to be rebuilt several times by now as the TO 3 thermal compound was baked into dust over time. You want either a bigger sink, higher fan speed , or lower bias current than the original's 2.5 amps if you want long term reliability of the output stage. The original output devices were beta matched and the emitter resistors were upgraded by Krell from carbon composition to non inductive wire wound 1 ohm.

Last edited by ticknpop; 18th October 2013 at 01:55 PM.
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Old 18th October 2013, 05:35 PM   #465
AndrewT is offline AndrewT  Scotland
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Jim's sold you the PCB.
He is the one to give customer support.
If he is not equipped to give the required support to builders, then he should not be selling PCBs.
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Old 20th October 2013, 08:52 PM   #466
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Default Board wiring

Thanks for your reply Andrew it's so nice to know how unhelpful you are lets hope you don't want help in the future.
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Old 21st October 2013, 08:08 AM   #467
AndrewT is offline AndrewT  Scotland
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Why should we support Jim's?
He is stealing his product IP from other people and businesses.

If a Forum Member goes to Jim's for stolen IP kit or PCB then Jim's should support that "customer".

This Forum has a strict Rule on not linking to sites that infringe copyright and IP.
If Jim's just avoids using the "name" for every product to bypass our Rule, does that morally equate to "not stealing"?
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Old 21st October 2013, 08:59 AM   #468
neychi is offline neychi  Croatia
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Quote:
Originally Posted by AndrewT View Post
Why should we support Jim's?
He is stealing his product IP from other people and businesses.

If a Forum Member goes to Jim's for stolen IP kit or PCB then Jim's should support that "customer".

This Forum has a strict Rule on not linking to sites that infringe copyright and IP.
If Jim's just avoids using the "name" for every product to bypass our Rule, does that morally equate to "not stealing"?
"A patent for an invention is the grant of a property right to the inventor, issued by the United States Patent and Trademark Office. Generally, the term of a new patent is 20 years from the date on which the application for the patent was filed in the United States or, in special cases, from the date an earlier related application was filed, subject to the payment of maintenance fees. U.S. patent grants are effective only within the United States, U.S. territories, and U.S. possessions. Under certain circumstances, patent term extensions or adjustments may be available.

The right conferred by the patent grant is, in the language of the statute and of the grant itself, “the right to exclude others from making, using, offering for sale, or selling” the invention in the United States or “importing” the invention into the United States. What is granted is not the right to make, use, offer for sale, sell or import, but the right to exclude others from making, using, offering for sale, selling or importing the invention. Once a patent is issued, the patentee must enforce the patent without aid of the USPTO.

There are three types of patents:

1) Utility patents may be granted to anyone who invents or discovers any new and useful process, machine, article of manufacture, or composition of matter, or any new and useful improvement thereof;

2) Design patents may be granted to anyone who invents a new, original, and ornamental design for an article of manufacture; and

3) Plant patents may be granted to anyone who invents or discovers and asexually reproduces any distinct and new variety of plant."

General Information Concerning Patents
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Last edited by neychi; 21st October 2013 at 09:05 AM.
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Old 20th December 2013, 07:30 PM   #469
spurlte is offline spurlte  United States
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Default Hooked Up.

I was able to get back to work on the KSA-100 MKII. I have a photo of using ADCOMM GFA-555 heatsinks. I hooked up a benchtop PS +-
30v 4A to the Jim's Audio driver boards and output boards today and got got bias readings 3mv-6mv adjusting variable resistor VR2 with
10.2volts at the +Vc on the output board. But I have 16.3volts at -Ve with no Bias readings across all its 1ohm 5W emitter resistors at all. What could cause the voltage difference btw Vc and Ve? I read somewhere that the MJE15... transistor are for bias control. No? Should I take out neg side Bias controllers to test for breakdown? I hard wired the collectors from output transistors to output boards as I insulatated heatsinks from the collectors--I didn't want live heatsinks.
Also, I checked for dc offset by tieing both + and - outputs measuring dc voltage across the tie to ground (is this correct?) and get
4Vdc. This is terribly wrong, no? Variable resistor P1 is not adjusting the dc offset at all. I am now thinking I got myself into more than I can
chew.
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Old 21st December 2013, 09:02 AM   #470
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by spurlte View Post
I was able to get back to work on the KSA-100 MKII. I have a photo of using ADCOMM GFA-555 heatsinks. I hooked up a benchtop PS +-
30v 4A to the Jim's Audio driver boards and output boards today and got got bias readings 3mv-6mv adjusting variable resistor VR2 with
10.2volts at the +Vc on the output board. But I have 16.3volts at -Ve with no Bias readings across all its 1ohm 5W emitter resistors at all. What could cause the voltage difference btw Vc and Ve? I read somewhere that the MJE15... transistor are for bias control. No? Should I take out neg side Bias controllers to test for breakdown? I hard wired the collectors from output transistors to output boards as I insulatated heatsinks from the collectors--I didn't want live heatsinks.
Also, I checked for dc offset by tieing both + and - outputs measuring dc voltage across the tie to ground (is this correct?) and get
4Vdc. This is terribly wrong, no? Variable resistor P1 is not adjusting the dc offset at all. I am now thinking I got myself into more than I can
chew.
The retailer of the PCBs should be able to confirm the correct connections.
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