EL34 / KT66 SET
- pre65
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#106
There is always the option to try KT66 in ultralinear mode if I need to, just needs a small wiring change. There is an UL tap on my Hammonds.
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Edmund Burke
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- cressy
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#107
ive still got mr Is 5881s if you want to try them too phil, they dropped straight in on mine. also try kt77s, i thought they were much better than the el34s or the kt66s i tried. my favourite ones were a pair of el37s though. gorgeous sound was got from those
- pre65
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#109
Can anyone remind me about ultra linear ?
Do I still keep the G2 resistor (currently 120R 5W) in place when connecting G2 to the UL tap instead of anode ?
Do I still keep the G2 resistor (currently 120R 5W) in place when connecting G2 to the UL tap instead of anode ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
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#111
The Aladdin's cave!
It's purpose is to make sure screen Volts is slightly under anode Volts.
I would say so.pre65 wrote:Can anyone remind me about ultra linear ?
Do I still keep the G2 resistor (currently 120R 5W) in place when connecting G2 to the UL tap instead of anode ?
It's purpose is to make sure screen Volts is slightly under anode Volts.
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#112
Oh. Isn't there enough resistance in the TX winding to provide the same Mike or is the addition of the resistor a belt and braces option.Mike H wrote: I would say so.
It's purpose is to make sure screen Volts is slightly under anode Volts.
Just curious.
DTB
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#114
Doh. Yup, of course. I see what you mean.Nick wrote:No, because there is even more of the tx winding between b+ and the anode.
As you were class!
DTB
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- pre65
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#115
I've used a couple of 4mm plugs and sockets to make a jumper for normal use. For UL the jumper is removed and the blue socket goes to a blue socket on the OPT.
Only just fired it up in UL and it seems to have just a tiny smidge more "weight", but will give it a few more discs before a proper opinion.
Only just fired it up in UL and it seems to have just a tiny smidge more "weight", but will give it a few more discs before a proper opinion.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
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Edmund Burke
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#116
This thing about the screen resistor is a bit strange, fine as a theoretical basis but, as someone pointed out on another forum anode Volts is going to be way over screen Volts on the positive half cycles!
Ditto if screen were fixed to B+. I think the conclusion was it depends how robust the valve is. In other words has to be designed with that eventuality in mind. For this reason I think power pentode screens tend not to be able to pass high current, or else the wire must be able to withstand a high temperature.
Summink like that
Ditto if screen were fixed to B+. I think the conclusion was it depends how robust the valve is. In other words has to be designed with that eventuality in mind. For this reason I think power pentode screens tend not to be able to pass high current, or else the wire must be able to withstand a high temperature.
Summink like that
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
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#118
I have used loads of those high voltage plugs / sockets and the different colours just make it easier to connect things up in the correct manner - which is nice.Mike H wrote:Forgot to mention, very pretty colours Phil!
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
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Edmund Burke
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#119
Yes of course, just that it's different to boring red and black. I have also used alternative colours, just to relieve the monotony
Also cos often you can't get red or black cos everyone else has bought 'em!
Also cos often you can't get red or black cos everyone else has bought 'em!
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- pre65
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#120
It's still running with KT66 in UL mode and I like it a lot.
Perhaps tomorrow (or later today ) I will put the EL34 back in and try them in UL.
Perhaps tomorrow (or later today ) I will put the EL34 back in and try them in UL.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)