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F5 power amplifier
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Old 8th May 2008, 04:53 PM   #641
steve jones is offline steve jones  United States
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Default An amp simple enough for even a tube guy?

Hopefully a few quick questions. I'm a Neanderthal with SS stuff (still learning to walk upright I guess).

Gathering parts to build a pair of F5s to use with my Altec Model Nineteens.

I've received 2 pair of 2SK170 and 2SJ74 BLs matched at 6.7mA Idss.

Nelson just mentioned 8mA. Do I need to juggle any resistor values on the schematic to use what I've got, or is the Idss value not that critical to its circuit requirements?

Also, for the 0.47 and 100 ohm resistors, are non-inductive required (if wirewounds are used)?

Thanks,
-Steve
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Old 8th May 2008, 08:09 PM   #642
Zen Mod is offline Zen Mod  Serbia
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F5 power amplifier
Default Re: An amp simple enough for even a tube guy?

Quote:
Originally posted by steve jones
.........
Nelson just mentioned 8mA. Do I need to juggle any resistor values on the schematic to use what I've got, or is the Idss value not that critical to its circuit requirements?

Also, for the 0.47 and 100 ohm resistors, are non-inductive required (if wirewounds are used)?

Thanks,
-Steve

there is no need to alter values of resistors;

non inductive can't harm , but they aren't so critical ; at least in my book .....

use whatever you have now ; later you can go for fancy ones
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Old 8th May 2008, 08:31 PM   #643
Nelson Pass is offline Nelson Pass  United States
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F5 power amplifier
Default Re: An amp simple enough for even a tube guy?

Quote:
Originally posted by steve jones
I've received 2 pair of 2SK170 and 2SJ74 BLs matched at 6.7mA Idss.

Nelson just mentioned 8mA. Do I need to juggle any resistor values on the schematic to use what I've got, or is the Idss value not that critical to its circuit requirements?
If by chance you find yourself short on bias, you can raise the
values of R3 and R4 (or even eliminate them) to develop enough
voltage to get the bias current you want.
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Old 8th May 2008, 08:51 PM   #644
steve jones is offline steve jones  United States
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Thanks to both Zen Mod and Nelson for the help and advise.

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Old 8th May 2008, 08:57 PM   #645
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by steve jones
Thanks to both Zen Mod and Nelson for the help and advise.


who's Nelson ?
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Old 8th May 2008, 09:09 PM   #646
steve jones is offline steve jones  United States
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I only know of two Nelsons.

One is Mr Pass.

The other is:
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Old 8th May 2008, 09:16 PM   #647
nicoch58 is offline nicoch58  Europe
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Orazio Nelson ?
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Old 8th May 2008, 09:19 PM   #648
stoN_Cold is offline stoN_Cold  Serbia
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Default Hi!

You forgot this man!

Regards zeoN_Rider
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Old 8th May 2008, 10:23 PM   #649
Nicola is offline Nicola
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Question F5 article

Argh, the postman is putting his life at risk, i haven't received the April release of AXP yet. Would anybody accept to mail me a scan or when might it be available under FirstWatt ?

Has anybody already commented on how it sounds ?
Thanks
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Old 8th May 2008, 10:34 PM   #650
Nelson Pass is offline Nelson Pass  United States
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Very difficult without your address.
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