how to adjust the filament power ecc83

TBKK · 27th February 2011, 08:32 AM

hi,

does any anyone knows how to adjust the filament power ecc83

Rundmaus · 27th February 2011, 09:24 AM

Usually you will find a small knob on the underside of the tube, which can be adjusted between "cold" and "to hot to touch"...

Sorry for the joke, but what do you mean exactly by "adjusting the filament power"? The physical parameters as resistance, operating voltage/current and the resulting power consumption are fixed by the design of the heater - you do not normally "adjust" anything there...

Greetings,
Andreas

DF96 · 27th February 2011, 01:52 PM

Apply 12.6V between pins 4 and 5. Or apply 6.3V between pins 4+5 (joined together) and pin 9. Heater power is about 1.9W in either case.

TBKK · 27th February 2011, 02:28 PM

DF96,

Can i use an AC multimeter to adjust between the 4/5 - 9 pin, or must I disconnect the wires from the (6.3) trafo?

Rundmaus · 27th February 2011, 02:28 PM

Aaah,

filaments in series oder parallel was the question - "adjust the filament voltage" would be more appropriate then... [/nit-picking]

Andreas

DF96 · 02:47 PM

You can check the heater voltage by carefully putting a meter between pins 4 or 5 and pin 9. 4-9 or 5-9 should each show 6.3V, within about 5-10%. If the voltage is correct and the heater is working then the power will be correct. You do this while everything is connected.

What is your actual aim? Are you building or repairing something? Your question does not make sense, as there is no adjustment on the valve. Be careful when working inside live equipment. Don't let the probes slip, or short onto adjacent pins. If in doubt, find someone else to do it for you.

TBKK · 28th February 2011, 12:01 PM

DF96,

i have an preamp and it has two blue trimmers Baoter (w501 122t) on top of it
and want to adjust it

DF96 · 28th February 2011, 12:09 PM

I assume they are adjustments for a DC heater supply. What does the manufacturer's instructions say? Why do you think they need adjusting?

TBKK · 1st March 2011, 09:15 AM

I have no manual, i have turn and listen to it. But i don't
Hear anything want to be sure it adjust right.

The trimmer is connected to 6.3 volt AC
And to pin 4/5 and pin 9 with wires.
The trimmer is connected to the 6.3 volt and the
Middel contact is going to earth.

TBKK · 1st March 2011, 09:38 AM

df96

I have messure the voltage it's around
2.7-3.0 try to adjust it does not increase

27th February 2011, 08:32 AM	#1
TBKK diyAudio Member Join Date: Jun 2010	how to adjust the filament power ecc83 hi, does any anyone knows how to adjust the filament power ecc83

27th February 2011, 02:36 PM	#6
DF96 diyAudio Member Join Date: May 2007	You can check the heater voltage by carefully putting a meter between pins 4 or 5 and pin 9. 4-9 or 5-9 should each show 6.3V, within about 5-10%. If the voltage is correct and the heater is working then the power will be correct. You do this while everything is connected. What is your actual aim? Are you building or repairing something? Your question does not make sense, as there is no adjustment on the valve. Be careful when working inside live equipment. Don't let the probes slip, or short onto adjacent pins. If in doubt, find someone else to do it for you. Last edited by DF96; 27th February 2011 at 02:47 PM. Reason: additional comments

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27th February 2011, 09:24 AM	#2
Rundmaus diyAudio Member Join Date: Aug 2005	Usually you will find a small knob on the underside of the tube, which can be adjusted between "cold" and "to hot to touch"... Sorry for the joke, but what do you mean exactly by "adjusting the filament power"? The physical parameters as resistance, operating voltage/current and the resulting power consumption are fixed by the design of the heater - you do not normally "adjust" anything there... Greetings, Andreas

27th February 2011, 01:52 PM	#3
DF96 diyAudio Member Join Date: May 2007	Apply 12.6V between pins 4 and 5. Or apply 6.3V between pins 4+5 (joined together) and pin 9. Heater power is about 1.9W in either case.

27th February 2011, 02:28 PM	#4
TBKK diyAudio Member Join Date: Jun 2010	DF96, Can i use an AC multimeter to adjust between the 4/5 - 9 pin, or must I disconnect the wires from the (6.3) trafo?

28th February 2011, 12:01 PM	#7
TBKK diyAudio Member Join Date: Jun 2010	DF96, i have an preamp and it has two blue trimmers Baoter (w501 122t) on top of it and want to adjust it

28th February 2011, 12:09 PM	#8
DF96 diyAudio Member Join Date: May 2007	I assume they are adjustments for a DC heater supply. What does the manufacturer's instructions say? Why do you think they need adjusting?

1st March 2011, 09:15 AM	#9
TBKK diyAudio Member Join Date: Jun 2010	I have no manual, i have turn and listen to it. But i don't Hear anything want to be sure it adjust right. The trimmer is connected to 6.3 volt AC And to pin 4/5 and pin 9 with wires. The trimmer is connected to the 6.3 volt and the Middel contact is going to earth.

1st March 2011, 09:38 AM	#10
TBKK diyAudio Member Join Date: Jun 2010	df96 I have messure the voltage it's around 2.7-3.0 try to adjust it does not increase

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