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Grid Bias ? (Read 2628 times)
Brian
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Grid Bias ?
10/08/15 at 15:11:33
 
I have been told that Grid Bias has a hard or percussive sound compared to Cathode Bias.  But I have also been told this need not be so when the Grid Bias is implemented skillfully. Can someone point me to a tutorial on this skillful designing of Grid Biasing; either in a web site, or recommend a book I might buy which makes a good explanation, or shows a well designed circuit?
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k6wkd
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Re: Grid Bias ?
Reply #1 - 11/25/15 at 18:24:57
 
Brian,
I am a new member and very new to audio.  In my effort to come up to speed, I have purchased a book titled Vacuum Tube Audio by Jerry Whitaker and published by TAB/McGraw Hill.  Chapter 4 pg 111 has a discussion that may be of interest.  Perhaps you can find a copy used for a more reasonable price than a new copy.

Ken (k6wkd)
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Brian
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Re: Grid Bias ?
Reply #2 - 12/04/15 at 03:10:43
 
Thank you Ken, for the recommendation.
I am trying to collect a few books on amplifier design, this may be a good one.

Brian
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k6wkd
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Re: Grid Bias ?
Reply #3 - 12/04/15 at 17:39:06
 
You're welcome.  Had a couple of other thoughts.  Per my elec. engineer friends, Terman's Electronic and Radio Engineering 1947, is the classic.  I have a copy and it is excellent.  In fact, much of the info in Vacuum Tube Audio is taken verbatim from Terman.  Also, the RCA Receiving Tube Manual is a great reference.  Both are out of print but I have good luck building my library from used book sources such as Alibris, Amazon, Barnes and Noble and a number of others.  Sometimes the "old book smell" of some books can be overwhelming in my small study.  I had thought the smell came from dust, mold etc and tried airing, freezing, sunlight, microwave, Lysol spray etc.  No luck.  Then with some archival research, I discovered that the smell is generated by the acids in the paper reacting with the cellulose causing breakdown, hence the odor.  As a remedy, I put the offending books in clear plastic vegetable bags from our grocer. I can still read the titles but the odor is contained.  Books printed on acid free paper do not produce the odor.

Good luck with your library building.
Ken
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Brian
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Re: Grid Bias ?
Reply #4 - 12/05/15 at 00:33:20
 
I will try to find Terman's Electronic and Radio Engineering 1947. Thank you, Ken for the recommendation.

Brian
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