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AUDIO FORUMS >> D.I.Y. >> Grid Bias ?
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Message started by Brian on 10/08/15 at 15:11:33

Title: Grid Bias ?
Post by Brian on 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?

Title: Re: Grid Bias ?
Post by k6wkd on 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)

Title: Re: Grid Bias ?
Post by Brian on 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

Title: Re: Grid Bias ?
Post by k6wkd on 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

Title: Re: Grid Bias ?
Post by Brian on 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