ad200 mk3 power tubes

Orange Amps Technical Q&A's

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rooney99
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Post by rooney99 » Thu Feb 08, 2007 9:15 pm

Hi, I need to replace my power valves. I'm ordering a matched set of 4 svetlana kt88's winged c's. Can I just put them straight in or would I need to get a tech to set the bias?
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Simon Wicks
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Post by Simon Wicks » Fri Feb 09, 2007 12:19 pm

Its safer to get a tech to bias it. You can in theory plug them in but if the bias is wrong, it could do more than just knacker the new tubes. I dont tend to worry too much unless i'm going to thrash the amp, but its safer to get it biased.
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basskid
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Post by basskid » Fri Feb 09, 2007 9:39 pm

get it biased.
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bassdrop
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Post by bassdrop » Sat Feb 10, 2007 11:25 pm

Definitely, definitely, definitely, go to a tech to get the bias set correctly. The KT88's will run a bit differently compared to the stock 6550's, which the rebias will account for.
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rooney99
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Post by rooney99 » Mon Feb 12, 2007 10:40 am

Ok, just off the phone to a amp tech in Dundee. He said that no way should I put kt88's into my ad200. Too powerful he says! Any thoughts guys?
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a.hun
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Post by a.hun » Mon Feb 12, 2007 11:37 am

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by rooney99</i>
<br />Ok, just off the phone to a amp tech in Dundee. He said that no way should I put kt88's into my ad200. Too powerful he says! Any thoughts guys?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">http://forum.orangeamps.com/viewtopic.p ... kt88,ad200
(Ade Emsley designed the amp!) ;)

http://forum.orangeamps.com/viewtopic.p ... kt88,ad200
(Spacing issue? You've got a Mk 3 though...)

:)
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Simon Wicks
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Post by Simon Wicks » Mon Feb 12, 2007 1:42 pm

Too powerful? Er...you can put KT88s in a 50 watt Marshall if you want. KT88s only generate such huge power outputs by taking close to 1KV through the B+. Of course, your tech should know that ;) Maybe change a few of the dropper resitors in the B+ if thats needed at all.
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rooney99
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Post by rooney99 » Mon Feb 12, 2007 8:12 pm

I thought it'd be ok, not sending it to Dundee then. Found a good guy in Surrey who hopefully will do the business.

Cheers for the replies chaps.
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