DIY Transistor Amp Using NVA Boards

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pre65
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#241 Re: DIY Transistor Amp Using NVA Boards

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Daniel Quinn wrote: Sat Jun 04, 2022 1:33 pm
nationalise essential services .
In some ways I agree, but---------.

This is not the place for that discussion.

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#242 Re: DIY Transistor Amp Using NVA Boards

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This is not the place for that discussion.
Just checking... Nope, I didn't put you in charge and forget.
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#243 Re: DIY Transistor Amp Using NVA Boards

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Nick wrote: Sat Jun 04, 2022 1:44 pm
This is not the place for that discussion.
Just checking... Nope, I didn't put you in charge and forget.
I was not wanting to totally crap on Steve's thread, I was trying to suggest a new topic dedicated to the nationalisation question.

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#244 Re: DIY Transistor Amp Using NVA Boards

Post by andrew Ivimey »

Your choice Phil, whaddaya think?
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#245 Re: DIY Transistor Amp Using NVA Boards

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Well just start a new thread then.
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#246 Re: DIY Transistor Amp Using NVA Boards

Post by ed »

coincidence or synchronicity?

I was thinking about the elctricty use on Thursday...running in the triangle speakers with new units....
I swapped out the firstwatt F4 which my meter suggests was sucking 200 watts at all times with my class D which is a might more powerful and says 16 watts....

I didn't notice any degradation in sq, but I haven't had a serious listen for a while.....Paradise has been playing non-stop all week..
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#247 Re: DIY Transistor Amp Using NVA Boards

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I keep thinking the same about the f5. Not sure what it pulls out of the wall, but it is probably alot.
Perhaps i should put the a20 in instead. Although not having any nva speaker cables im a little concerned it might not like the cables i do have
Perhaps not then.
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#248 Re: DIY Transistor Amp Using NVA Boards

Post by Cressy Snr »

Ant wrote: Sat Jun 04, 2022 6:14 pm I keep thinking the same about the f5. Not sure what it pulls out of the wall, but it is probably alot.
Perhaps i should put the a20 in instead. Although not having any nva speaker cables im a little concerned it might not like the cables i do have
Perhaps not then.
Just try it. My amp is no longer using NVA cables and it is fine. As long as the cables are not Litz wires, you should be OK.
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#249 Re: DIY Transistor Amp Using NVA Boards

Post by jack »

Cressy Snr wrote: Sat Jun 04, 2022 6:26 pm
Ant wrote: Sat Jun 04, 2022 6:14 pm I keep thinking the same about the f5. Not sure what it pulls out of the wall, but it is probably alot.
Perhaps i should put the a20 in instead. Although not having any nva speaker cables im a little concerned it might not like the cables i do have
Perhaps not then.
Just try it. My amp is no longer using NVA cables and it is fine. As long as the cables are not Litz wires, you should be OK.
What's wrong with Litz?
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#250 Re: DIY Transistor Amp Using NVA Boards

Post by Cressy Snr »

jack wrote: Sat Jun 04, 2022 6:48 pm
Cressy Snr wrote: Sat Jun 04, 2022 6:26 pm
Ant wrote: Sat Jun 04, 2022 6:14 pm I keep thinking the same about the f5. Not sure what it pulls out of the wall, but it is probably alot.
Perhaps i should put the a20 in instead. Although not having any nva speaker cables im a little concerned it might not like the cables i do have
Perhaps not then.
Just try it. My amp is no longer using NVA cables and it is fine. As long as the cables are not Litz wires, you should be OK.
What's wrong with Litz?
Capacitance. NVA amps can go unstable driving excess pF.
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#251 Re: DIY Transistor Amp Using NVA Boards

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AFAIK. litz as a wire is not high capacitance, its just a lot of fine strands insulated from each other.
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#252 Re: DIY Transistor Amp Using NVA Boards

Post by Ant »

Nope, hums. Theres something up with it. Cant be doing with that, ill have to look into why its playing up at some point
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#253 Re: DIY Transistor Amp Using NVA Boards

Post by jack »

Cressy Snr wrote: Sat Jun 04, 2022 6:55 pm
jack wrote: Sat Jun 04, 2022 6:48 pm
Cressy Snr wrote: Sat Jun 04, 2022 6:26 pm
Just try it. My amp is no longer using NVA cables and it is fine. As long as the cables are not Litz wires, you should be OK.
What's wrong with Litz?
Capacitance. NVA amps can go unstable driving excess pF.
Qué? Litz is just a special wire made up of lots of insulated strands to reduce skin effect at RF frequencies.

Nothing to do with capacitance (AFAIK).
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#254 Re: DIY Transistor Amp Using NVA Boards

Post by Cressy Snr »

RD said it was capacitive so naturally I simply parrot what I’m told, as you do when you’re an English graduate and he is an engineer. Kimber Kable woven litz speaker cable or that twisted twin plaited CAT5 stuff that used to be popular, he told me would send his amps into paroxysms of terror.
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#255 Re: DIY Transistor Amp Using NVA Boards

Post by simon »

ed wrote: Sat Jun 04, 2022 5:46 pm coincidence or synchronicity?

I was thinking about the elctricty use on Thursday...running in the triangle speakers with new units....
I swapped out the firstwatt F4 which my meter suggests was sucking 200 watts at all times with my class D which is a might more powerful and says 16 watts....

I didn't notice any degradation in sq, but I haven't had a serious listen for a while.....Paradise has been playing non-stop all week..
Yes me too ed. The GM70 amp drags half a kilowatt out of the wall and more than a few times of late I've wondered just how much sound quality I might lose to class D, and if I can hear I prefer the valve amp how much is it worth to me?
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