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Old 8th September 2013, 12:09 AM   #3851
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Default JLLH

JLLH is John Laurence Linsley Hood.
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Old 8th September 2013, 03:07 PM   #3852
wrath is offline wrath  Poland
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What changes should be made to:
- Have gain 2 or so
- use bf245 instead of unobtanium ;-)
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Old 12th September 2013, 07:55 AM   #3853
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Default Advice on adding Self Tone Controls to Pass B1

Hi,
Sorry not to be a purist but given the range of material that we play I have come to the conclusion that some tone "tweaking" is needed.
I already have a Pass B1 buffer feeding my Aleph power amp. I am planning to simply insert the Self tone control board between these two.
This may sound naive but so far I cannot see any problems.. except perhaps that the P1 is now superfluous.

Can anyone advise / comment on this plan .. but avoid arguing about tone controls please?

Thanks for the help

George
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Old 13th September 2013, 02:13 AM   #3854
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Hi, quite simply, if you put any other electronic circuit in the signal path you will degrade the ability of your system picking up micro dynamics. Being able to pick up as much info (micro dynamics) is the difference between a stereo system and a Hi-Fi system. Our aim in pursuing Hi-Fi is to keep the info intact not degrade it.
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Old 13th September 2013, 07:50 AM   #3855
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And there I specifically asked anyone who might respond not to get into the tone control argument. I really tried to keep this a technical question but once you get near fundamentalists, of any sort, reasonable debate goes out of the window.
Please, technically, will there be a matching problem between the B1 and the Self pre-amp.. and do I still need the B1 in any case?
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Old 13th September 2013, 09:01 AM   #3856
Itsmee is offline Itsmee  England
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I haven't seen the Self tone control, the B1 may still be useful to buffer the output.
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Old 13th September 2013, 09:11 AM   #3857
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Hi,

the link at Elektor is Preamplifier 2012 (1) - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement to see a good description of the PCB, components and performance.
I also feel that the B1 could still be useful .. and I hate to have to remove it. But ......
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Old 13th September 2013, 09:39 AM   #3858
Itsmee is offline Itsmee  England
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10 credits to download the PDF, I also see it has lots of opamps.....

All I can say is try it to see if you like it. And yes, the B1 does look like it will be superfluous.

But personally, I would live with the B1 for a little while, you will get use to the 'tone' fairly quickly.
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Old 13th September 2013, 09:47 AM   #3859
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Hi,

Thanks for that advice.. and I feel that I have got used to the B1 "tone" already. The problem is more that I play a lot of rather old recordings as well as new and the sound balance (and interest) varies enormously.
Also, I still find it interesting that no one seems to worry about compensating for the reduced and uneven sensitivity of the ear when listening at low volume levels. The only speaker that I know which makes low-level sounds appear to be simply further away is the Quad electrostatic. My conventional speakers (JBL 4343 and Yamaha NS1000M) just make it low-level sounds thin and sort of "reedy" rather than farther off..
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Old 16th September 2013, 03:13 AM   #3860
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Default No Tone

The object of the B1 and like designs is that it does not have a tone as such, yes every electronic circuit or component will have some adverse effect on the sound. No electronic component can make a recording sound better. It can however change the sound more so your liking. If you are getting a variation in your level of enjoyment then I would suggest you need to upgrade your front end
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