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Post by Paul (TRANE) on Sept 14, 2008 20:20:23 GMT -7
What is the limit, for reliable operation, for plate voltage on the GT-KT66C? Just curious.
Paul G.
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Post by dixiechicken on Sept 17, 2008 15:03:20 GMT -7
DC here! According the the manual from G.E.C: DC Anode Voltage design Max = 500V DC Anode Voltage absolute max = 550V Absolute maximum Anode dissipation = 30W Design maximum Anode dissipation = 25W DC Screen voltage design maximum is = 500V DC Screen voltage absolute maximum is = 550V DC cathode current design max and absolute max = 200mAmps I can email you the complete spec if you will. CAVEAT: This is NOT necessarily the exact same figures as for the GT-KT66-C variants. This is for the G.E.C NOS version i presume.Cheers: Dixiechicken!
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Post by myles on Sept 17, 2008 15:55:38 GMT -7
Actually ... above 450-475 things can fail on occasion.
The HP went to 525+ with ease.
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Post by Paul (TRANE) on Sept 17, 2008 21:13:55 GMT -7
DC and Myles,
Thanks for the knowledge sharing. I had not seen an actual KT66C spec. I appreciate the help with this.
Paul G.
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Post by myles on Sept 18, 2008 7:42:40 GMT -7
DC and Myles, Thanks for the knowledge sharing. I had not seen an actual KT66C spec. I appreciate the help with this. Paul G. Do not rely on spec sheets as these are design targets and there are few if any of today's tubes that come anywhere close to the design spec unfortunately. I post things as I did here on the JJ 803S in the tube area as I test various tubes that show actual info and not just copy spec. Many of these reports are also on my website.
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Post by dixiechicken on Sept 18, 2008 12:25:15 GMT -7
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Post by myles on Sept 18, 2008 12:37:32 GMT -7
This is fine and dandy for KT66-C
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Post by Paul (TRANE) on Sept 18, 2008 14:05:56 GMT -7
Interesting. My amp runs 450V to 465V. Maybe I am just a little to high sometimes with voltage transients from the wall and such.
Paul G.
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Post by Deleted on Sept 18, 2008 21:49:28 GMT -7
I know every amp is different but it seems that the softness or hardness of a set of tubes can effect where the plate voltage will run also.
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Post by myles on Sept 19, 2008 8:36:12 GMT -7
I know every amp is different but it seems that the softness or hardness of a set of tubes can effect where the plate voltage will run also. You are correct. A #6 for example will need more bias to keep at the same mA reading as #5 set and a #6 will draw different current at the same setting than a #5. As things are adjusted the load on the power supply changes and will show different results on a #5 or #6 set as an example.
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Post by Paul (TRANE) on Sept 19, 2008 9:38:28 GMT -7
Yep. With a #6 set I am running right at 465V on the plates. Soudns great. Hopefully, not stressing the tubes too much. I have a set of Genalex Gold Lion (a 34 rating from Tube Depot) and they run at 450V. Sounds great with either tube type in it.
Paul G.
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Post by myles on Sept 19, 2008 9:45:29 GMT -7
Yep. With a #6 set I am running right at 465V on the plates. Soudns great. Hopefully, not stressing the tubes too much. I have a set of Genalex Gold Lion (a 34 rating from Tube Depot) and they run at 450V. Sounds great with either tube type in it. Paul G. Paul, The Genelex umber of 34 really means nothing as we don't know what plate voltage and bias that number was derived at but it sounds from your description that the two sets are operating in a different range.
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Post by Paul (TRANE) on Sept 19, 2008 9:52:44 GMT -7
Yep. Definitely in different ranges. The first set of Genalex I had in the amp were part of a batch that had manufacturing issues. So they died pretty quickly. Got the GT-KT66C #6 and had them go down too. I have since heard of a few complaints of dirty power where I was playing when they died. The new genalex set is doing good but does not run in the same range. Will probably be putting in another GT-KT66C #6 set here soon. Should bias up right around 465V (if experience proves out to be accurate again). Based on what you indicated earlier 465V should be permissable with this tube set. Unless I read it wrong.
Paul G.
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Post by myles on Sept 19, 2008 10:02:30 GMT -7
Yep. Definitely in different ranges. The first set of Genalex I had in the amp were part of a batch that had manufacturing issues. So they died pretty quickly. Got the GT-KT66C #6 and had them go down too. I have since heard of a few complaints of dirty power where I was playing when they died. The new genalex set is doing good but does not run in the same range. Will probably be putting in another GT-KT66C #6 set here soon. Should bias up right around 465V (if experience proves out to be accurate again). Based on what you indicated earlier 465V should be permissable with this tube set. Unless I read it wrong. Paul G. Paul, You will be fine.
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Post by Paul (TRANE) on Sept 19, 2008 13:54:41 GMT -7
Myles,
Thanks for the benefit of your knowledge and wisdom with tubes and all things tone.
Paul G.
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Post by myles on Sept 19, 2008 15:51:56 GMT -7
Myles, Thanks for the benefit of your knowledge and wisdom with tubes and all things tone. Paul G. Paul ... You are more than welcome .... anytime. Myles
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