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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 2nd April 2013, 05:06 PM   #101
sagi4422 is offline sagi4422
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Basic questions on configuring Tube AMP
Any suggestions ?
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Old 4th April 2013, 12:39 AM   #102
rknize is offline rknize  United States
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This is just eye-candy, so it is kind of up to you to figure out how to use whatever meter you happen to find and like. You are probably going to have to find something on eBay or similar. There is software out there to print out new legends for various meter styles.

All D'arsonval meters work on the same principals. They are current measuring devices...usually very low currents. Some sort of shunt or series resistance is required to scale the meter's movement the way you'd like. Most meters that you'll find are roughly similar. A 2V and a 200V meter is usually the same meter with a different series resistor. Meters for measuring current use a shunt instead. Some meters you'll find already have the shunt while others expect you to provide it.

I suggest you use Google and start reading.
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Old 4th April 2013, 01:50 AM   #103
boywonder is offline boywonder  United States
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meterscale software

Meter - meterscale drawing program from Tonne Software
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Old 4th April 2013, 02:48 AM   #104
rknize is offline rknize  United States
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Yes, that is the software that Peter Millett used on his power supply.

Also, I should mention that the only time you typically see meters on a power amplifier is to guesstimate power output in Watts (FWIW). So if you assume an 8 ohm load and you want the meter to read full scale at a certain RMS power output, then you can calculate roughly what voltage to setup the meter for...at least for a sine wave.
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Old 10th April 2013, 08:32 PM   #105
sagi4422 is offline sagi4422
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Basic questions on configuring Tube AMP
Hi Guys.
Today I checked all the configurations of the Simple SE.
The UL is not working good . When I am configuring to UL I hear whistle like a siren .
Did you heard something like this before ? ( the triode is working OK )
Thanks
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Old 10th April 2013, 09:20 PM   #106
rknize is offline rknize  United States
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Sounds like something may be hooked up backwards. Are you using cathode feedback, by chance?
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Old 10th April 2013, 09:28 PM   #107
sagi4422 is offline sagi4422
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Basic questions on configuring Tube AMP
I am not sure, when I heard the sound, if I were using CFB or not. Arent they work together?
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Old 10th April 2013, 10:18 PM   #108
rknize is offline rknize  United States
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They are two different things, but you typically want to use CFB with UL. For CFB to work, you actually have to invert the phase of the OPT secondaries so that you get negative feedback and not positive feedback. If you get it backwards, your amp becomes an oscillator.
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Old 11th April 2013, 05:02 AM   #109
boywonder is offline boywonder  United States
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As Russ mentioned, you want negative feedback. Positive feedback makes an oscillator that quickly sounds like a siren.....

You may have a polarity reversed somewhere.
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Old 11th April 2013, 03:37 PM   #110
sagi4422 is offline sagi4422
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Basic questions on configuring Tube AMP
Hi.
Isn't the CFB switch in charge of inverting the polarity of the OPT's secondaries?
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