Output filament suppy

tbie · 12th June 2011, 06:50 AM

Sorry for a dumb question. I am new to tubes and amp building. I completed breadboarding TSE and was going through checkout. George mentions to place a multimeter across filament supply for output tubes. Where exactly should I place the clips?

Thanks.

Evenharmonics · 12th June 2011, 02:50 PM

Where it says "2" on the board where output tube socket goes.

tbie · 13th June 2011, 12:08 AM

Everharmonics, Thank you. It measures 5V at output tube socket. I set this up for 300B so I assume this is what I want.

Output grid voltage at R14 and R25 when set to most negative voltage are -89 and -295V respectively. Is this right? Why the difference?

tbie · 13th June 2011, 12:50 AM

Everharmonics, Thank you. It measures 5V at output tube socket. I set this up for 300B so I assume this is what I want.

Output grid voltage at R14 and R25 when set to most negative voltage are -89 and -295V respectively. Is this right? Why the difference?

Richard Ellis · 13th June 2011, 01:23 AM

Pins One & Four................at three-o-clock & six-o-clock as you view the tube from the bottom, Keyed at Twelve. 5V @ 1.2A draw.

__________________________________________________ __Rick...........

Evenharmonics · 13th June 2011, 02:13 AM

Quote:

Originally Posted by tbie

It measures 5V at output tube socket. I set this up for 300B so I assume this is what I want.

Yes.

Quote:

Output grid voltage at R14 and R25 when set to most negative voltage are -89 and -295V respectively. Is this right? Why the difference?

They should be similar (around -80v for mine). Measure from output tube socket where it says "1" in both channels.

tbie · 13th June 2011, 02:56 AM

I will check tube socket 1 tomorrow after work. I guess the abnormal voltage has its effect. right channel/speaker is not playing.
B+ is 372V at grid bias of 63mA on Right and 67mA in left. Rectifier is the brightest with bright orange, output tubes barely glow but when seen from top there is glow. No smell of burning plastic either. Don't know why there is o output from right. Any suggestions, I will look into it tomorrow.
By the way, one speaker is way way way loud for a 15X26 foot room. By mistake I omitted volume pot, that thing goes in first. Connected a Denon DVD player with no volume control. Big mistake.

tbie · 13th June 2011, 02:59 AM

By the way I connected my old, in the closet, Klipsch synergy B1. This is a tiny bookshelf speaker, the detail is amazing, instruments crisp as crisp could be. I can't wait to get the second channel working.
George, Thanks for such a wonderful design made so simple.

12th June 2011, 06:50 AM	#1
tbie diyAudio Member Join Date: May 2011 Location: Canton, OH	Output filament suppy Sorry for a dumb question. I am new to tubes and amp building. I completed breadboarding TSE and was going through checkout. George mentions to place a multimeter across filament supply for output tubes. Where exactly should I place the clips? Thanks.

13th June 2011, 12:08 AM	#3
tbie diyAudio Member Join Date: May 2011 Location: Canton, OH	TSE checkout Everharmonics, Thank you. It measures 5V at output tube socket. I set this up for 300B so I assume this is what I want. Output grid voltage at R14 and R25 when set to most negative voltage are -89 and -295V respectively. Is this right? Why the difference?

13th June 2011, 12:50 AM	#4
tbie diyAudio Member Join Date: May 2011 Location: Canton, OH	TSE checkout Everharmonics, Thank you. It measures 5V at output tube socket. I set this up for 300B so I assume this is what I want. Output grid voltage at R14 and R25 when set to most negative voltage are -89 and -295V respectively. Is this right? Why the difference?

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12th June 2011, 02:50 PM	#2
Evenharmonics diyAudio Member Join Date: Apr 2007	Where it says "2" on the board where output tube socket goes.

13th June 2011, 01:23 AM	#5
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	Pins One & Four................at three-o-clock & six-o-clock as you view the tube from the bottom, Keyed at Twelve. 5V @ 1.2A draw. __________________________________________________ __Rick...........

13th June 2011, 02:56 AM	#7
tbie diyAudio Member Join Date: May 2011 Location: Canton, OH	I will check tube socket 1 tomorrow after work. I guess the abnormal voltage has its effect. right channel/speaker is not playing. B+ is 372V at grid bias of 63mA on Right and 67mA in left. Rectifier is the brightest with bright orange, output tubes barely glow but when seen from top there is glow. No smell of burning plastic either. Don't know why there is o output from right. Any suggestions, I will look into it tomorrow. By the way, one speaker is way way way loud for a 15X26 foot room. By mistake I omitted volume pot, that thing goes in first. Connected a Denon DVD player with no volume control. Big mistake.

13th June 2011, 02:59 AM	#8
tbie diyAudio Member Join Date: May 2011 Location: Canton, OH	By the way I connected my old, in the closet, Klipsch synergy B1. This is a tiny bookshelf speaker, the detail is amazing, instruments crisp as crisp could be. I can't wait to get the second channel working. George, Thanks for such a wonderful design made so simple.

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