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Old 30th October 2011, 12:10 AM   #341
JimM is offline JimM  United States
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Toshiba parts?
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Old 30th October 2011, 12:18 AM   #342
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5 bucks a pair for 50 cent parts would be amusing.

(but how does it sound with J77/K214)
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Old 30th October 2011, 12:49 AM   #343
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Could you tell me where to get them for .50$ as i would like to get some more. Yes JimM, I have matched Toshiba 2SK2013/2sj313 from a group buy that did not pan out.
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Old 30th October 2011, 01:03 PM   #344
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I have a question regarding the implementation of the BA-3/B and BA-2 FE's as modules. In passing the signal from a standalone unit containing the FE, does the signal wire need to be grounded. I realized as I was putting the two FE's in their seperate enclosures, that the BA-3 only had a single signal output, whereas the BA-2 has a signal output plus the requirement for a feedback signal. If it is necessary to ground this output, then i will have to use an RCA for BA-3 and XLR for BA-2. I know that in the same amp, this requirement for grounding does not exist, but was unsure if passing the signal from one case to another required it. I have a umbilical chord made of 4 pin Speakon connectors bringing earth and signal ground as well as associated DC connections from output stage and PSU.
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Old 30th October 2011, 01:58 PM   #345
generg is offline generg  Germany
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I had a little difficulties to understand your words... German....ha, ha

but I think you see the matter correct

grounding is necessary for both BA-3 and old frontend and the old frontend also needs the feedback cable......

Gerd
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Old 30th October 2011, 03:35 PM   #346
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Quote:
Originally Posted by buzzforb View Post
.50$
Referred to the Fairchilds.

($5 for J313/K2013 is expensive, they do $4.5/pair in Japan )
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Old 30th October 2011, 09:49 PM   #347
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I know that in the same amp, this requirement for grounding does not exist, but was unsure if passing the signal from one case to another required it. I have a umbilical chord made of 4 pin Speakon connectors bringing earth and signal ground as well as associated DC connections from output stage and PSU.
I have been mulling over this same problem. I think you need to take the ground from the BA-3 via an interconnect to the star ground of the power supply of the power board. My problem with this is that you will need another high quality interconnect ie, one from the pre-amp to your BA-3 and then another from the BA-3 to the power side. I think this arrangement is more likely to cause signal problems (interference) than using an external power supply feeding your BA-3 inside the power output chassis. I am favouring the latter idea now.
Chris
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Old 30th October 2011, 09:54 PM   #348
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But I learn ... Do you have to wait a long time for your replacements?
Should know tomorrow if I can get hold of the mosfets. However, I have been making good use of my time by putting together a Salas regulated power supply for the BA-3 (or the BA-2 if I wish).
Chris
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Old 30th October 2011, 10:10 PM   #349
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Quote:
Originally Posted by Backbones View Post
I have been mulling over this same problem. I think you need to take the ground from the BA-3 via an interconnect to the star ground of the power supply of the power board. My problem with this is that you will need another high quality interconnect ie, one from the pre-amp to your BA-3 and then another from the BA-3 to the power side. I think this arrangement is more likely to cause signal problems (interference) than using an external power supply feeding your BA-3 inside the power output chassis. I am favouring the latter idea now.
Chris
IF done properly, I don't see why it would be any different than a usual preamp/amp setup. If I like what i hear, I will probably go to a passive volume control as the BA-3 will become the new "preamp". The reason I like the idea is ease of construction on FE options. If you can run it off the PSU of the output stage, you drop building complexity and interchangeability becomes simple. Connections can be as short as 1-1/2' feet.
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Old 30th October 2011, 10:53 PM   #350
rsdio is offline rsdio  United States
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Quote:
Originally Posted by buzzforb View Post
In passing the signal from a standalone unit containing the FE, does the signal wire need to be grounded. I realized as I was putting the two FE's in their seperate enclosures, that the BA-3 only had a single signal output, whereas the BA-2 has a signal output plus the requirement for a feedback signal. If it is necessary to ground this output, then i will have to use an RCA for BA-3 and XLR for BA-2. I know that in the same amp, this requirement for grounding does not exist, but was unsure if passing the signal from one case to another required it. I have a umbilical chord made of 4 pin Speakon connectors bringing earth and signal ground as well as associated DC connections from output stage and PSU.
If you're concerned about grounding issues, then you really should just stick to XLR balanced signal interconnects. I would not recommend speakON for line level signals, but rather restrict that connector to power and speaker interconnects.

RCA was designed as an interconnect within a single chassis. The unfortunate fact that it was abused to link multiple chassis is a mistake of the consumer market. If you use XLR balanced instead, then these grounding issues that you describe fall out (provided that you properly wire your XLR outputs and inputs).

Unfortunately, I don't know what to suggest for the preamps and amplifiers that do not support balanced I/O. Personally, I am limiting my DIY experiments to balanced, so that means skipping the unbalanced designs or modifying them for balanced. There are plenty of balanced designs from Nelson Pass to keep me busy, so I'm not fretting over the limitations.
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