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Forums :: Ask Amp Tech Expert Skip Simmons

tube bias for Harp King?

2 replies [Last post]
Thu, 02/03/2011 - 17:08
bob freeze
bob freeze's picture
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Joined: 01/03/2010

I need to replace the power tubes in my Harp King 6x10 (KT90) . I have two matched tubes that show a bias point of 37. I have no idea what the original tubes bias point was and it does not appear that John has a point on the chasis for the bias to be adjusted. I have no tech ability, but my bass player has extensive background with all tech aspects. Just hate to let him touch it until I get a little more info. Have an email in to John Kinder, but getting in touch with John can often take some time.
I don't want to hurt this amp - can't go to the local music store to get a replacement.

Bob Freeze

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Thu, 02/03/2011 - 20:09
#1
Expert Skip Simmons
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Joined: 01/18/2010
tube bias

Hello Bob- This question is a little outside the scope of this forum. You should call or email me for some specific service info on your particular amp. The Harp King amps that use the KT-90 can be challenging since the tube is no longer in production. Of course, my question for you is - how do you know that you need new tubes? I service Rick Estrin's Harp King, and it has had the same pair for several years.

Skip Simmons

Skip Simmons Harp Amps

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Thu, 02/03/2011 - 22:03
#2
bob freeze
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Joined: 01/03/2010
bias

Skip,
I sent an email to you.

Bob

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