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Old 9th July 2010, 05:55 PM   #171
generg is offline generg  Germany
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I thank you very very much ..... You are the only one reacting incredibly fast et tres amicalement. If there were a Nobelprice for persons in the Internet I would give it to you...

O.k. I calm down ......" head 16" of Zen Mod well done, you can sleep the rest of the day!
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Old 9th July 2010, 06:04 PM   #172
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in your boots - I'll keep that cap in place ...... and forget about DC coupling

it's better to flip in polarity entire input stage , making it with DC coupling in mind from the start

edit:

A40 ring a bell ?

editedit

A40 , Aclass , Citation by Papa

just few examples as food for thought - just look at biasing technicues
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File Type: gif Aclass.GIF (31.6 KB, 670 views)
File Type: gif CIT.GIF (40.0 KB, 624 views)
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Last edited by Zen Mod; 9th July 2010 at 06:17 PM.
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Old 9th July 2010, 06:32 PM   #173
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Two reasons to get the cap away for two days


- First reason, caps can sound so different for example Black Gate versus Silmic or a good film capacitor

- Second reason, on the way I learn to observe the parts that do biasing

I wanted to write this, but you were faster and delivered already material, thanks again!
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Old 9th July 2010, 06:39 PM   #174
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Quote:
Originally Posted by generg View Post
Two reasons to get the cap away for two days


....
no need for thankssssss

also - observe feedback taking points/ways ;

that way DC behavior of output is much less critical
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Old 17th August 2010, 09:46 PM   #175
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Default Gatestoppers

...... I was a little bit playing with the value of the gatestoppers in the output stage. Between 50 and 220 Ohm, the difference in the sound is big!

Why? I supposed these values to work in the range of 200 Mhz.

Is the brighter sound with 50 Ohm the result of an oscillation?


Any answer welcome!
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Old 17th August 2010, 11:00 PM   #176
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ZM,

#170 graphic carries the erroneous zener connection on the
output stage.

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Old 17th August 2010, 11:46 PM   #177
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Quote:
Originally Posted by generg View Post
...... I was a little bit playing with the value of the gatestoppers in the output stage. Between 50 and 220 Ohm, the difference in the sound is big!

Why? I supposed these values to work in the range of 200 Mhz.

Is the brighter sound with 50 Ohm the result of an oscillation?


Any answer welcome!
Possibly, but not necessarily.
Have you got an oscilloscope?
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Old 7th September 2010, 05:40 AM   #178
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Hi to every one at DIY Audio.
I have just become a member, and been checking out all the cool stuff on the site (I swear I can literaly smell the solder fumes wafting from the pages !).
I have been mainly building recording type stuff for a while now, but me thinks it's time for a new amp !
Am posting here first as I think this new amp should be one of Nelsons BA-1's, the second I lay eyes on the circuit I fell in love with it at once (Zen looks cool as well).
Was a bit surprised to see that it seemed to me not that many folks are building them compared to lots of other amps, maybe it's just a bit slow off the blocks or maybe the thought of two dozen trannys bolted on to a miniature nuclear reactor is a bit scarey even for the hefty heat-sinkers at DIY Audio.
I built my last amp back in 1988 which was nailed to a plank (and even used at a few partys like that) for a few years untill boxed. Ever since then I have switched on this well behaved solid state box and simply enjoyed listening to music. In my nightmares however I have been terrorised by swarms of molten glass 300B's chasing me down endless tunnels of sound, "You must listen to us !" they all screamed, at an ear shattering 1/2 watt.
Anyway, when Nelson dreamed up the BA-1 he seems to have unknowingly mixed the prescription to cure my 300B anxietys for good.
Anough of this sillyness. I am pretty darn sure the BA-1 is THE 1 4 me, I would welcome any comments from BA-1er's out there as to how they think this amp might be suited to my main setup at the moment, which is:

-Thorens TD160B MKII, SME Model 3009, Goldring 1006
-DIY Phono Preamp
-Rotel RCD-965BX 1 bit (haven't even ever had it open)
-DIY Ben Duncan PAS-02 Preamp
-DIY Well Behaved Tranny Amp 30W'ish (soon to be BA-1?)
-DIY Richard McDonald Transmission Lines hard-wired with Van den Hul The Wind

I listen to almost every style of music (and spoken word)
there is, and may even use this with a tele setup in the future, so I like an honest and universal system.
I think the BA-1 might be great with the transmission lines, not sure how my PAS-02 would get on with it's inputs though, maybe fine maybe not.
I would be interested in hearing from the BA bunch and
any other members as to whether they think I might end up a single ended happy bunny. cheers Simon
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Old 7th September 2010, 06:09 AM   #179
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Quote:
Originally Posted by The Space Egg Corp View Post

-DIY Richard McDonald Transmission Lines hard-wired with Van den Hul The Wind
Can you start a thread and tell us more about those?

dave
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Old 7th September 2010, 06:28 AM   #180
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Hi Dave
Thanks for your interest in the Transmission Lines.
Am just getting the hang of the site.
That was my 1st post.
Am not quite sure how to start a thread just yet.
Hopefully I will become a pro poster soon enough though.
I saw the links at the bottom of your message.
Are you a Transmission Line fan?
Simon
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