Power switch symbol on schematic

jjai · 21st June 2005, 06:12 PM

I have a Sunn Beta Lead guitar amp (100 W solid state) that I have a couple quick questions about - hoping someone can help out:

- in the schematic, there is a symbol that looks like a capacitor with a circle around but no values -- it connects between one pole of the power switch to the white wire from the power cord. What is this thing? (I think the power switch was replaced at some point - it doesn't fit in the chassis hole properly and I don't see this mystery component anywhere.) Also, the loose wire is connected directly to another wire (white wire from power cord directly to black wire on transformer).

- when I power down the amp, there is a very loud pop. (I think I've blown two speakers because of this now). Could this be related to the missing mystery component? (Is this a "snuffer cap," which I've read about on these forums?)

Here's a link to a schematic:
http://www.dangpow.com/~sunn/svcmans...tamanual22.jpg
(see lower left corner)

Thanks a lot in advance --
jjai

Mr Evil · 21st June 2005, 06:23 PM

It's some sort of bulb, isn't it?

vAD · 21st June 2005, 06:33 PM

Yes, seriously, it is necessary to think!)))
sorry

imix500 · 21st June 2005, 06:33 PM

That's a neon lamp.

anatech · 22nd June 2005, 02:29 AM

It sure looks like a neon. And it being gone will not hurt a thing. There should be a resistor in series with it if it were a neon. So I think it's an AC outlet on the back.

From looking at the diagram I would say the turn off "pop" is normal. I doubt it would blow a speaker. To reduce it, install an MOV across the primary of the transformer to clamp the turn off spike. V130LA10A or similar for 120 VAC circuits.

-Chris

21st June 2005, 06:12 PM	#1
jjai diyAudio Member Join Date: Mar 2005 Location: San Francisco, CA	Power switch symbol on schematic I have a Sunn Beta Lead guitar amp (100 W solid state) that I have a couple quick questions about - hoping someone can help out: - in the schematic, there is a symbol that looks like a capacitor with a circle around but no values -- it connects between one pole of the power switch to the white wire from the power cord. What is this thing? (I think the power switch was replaced at some point - it doesn't fit in the chassis hole properly and I don't see this mystery component anywhere.) Also, the loose wire is connected directly to another wire (white wire from power cord directly to black wire on transformer). - when I power down the amp, there is a very loud pop. (I think I've blown two speakers because of this now). Could this be related to the missing mystery component? (Is this a "snuffer cap," which I've read about on these forums?) Here's a link to a schematic: http://www.dangpow.com/~sunn/svcmans...tamanual22.jpg (see lower left corner) Thanks a lot in advance -- jjai

21st June 2005, 06:23 PM	#2
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	It's some sort of bulb, isn't it? __________________ https://mrevil.asvachin.eu/

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21st June 2005, 06:33 PM	#3
vAD diyAudio Member Join Date: Apr 2005 Location: Russia	Yes, seriously, it is necessary to think!))) sorry

21st June 2005, 06:33 PM	#4
imix500 Proud Union Member diyAudio Member Join Date: Mar 2004 Location: Nashville, TN	That's a neon lamp.

22nd June 2005, 02:29 AM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	It sure looks like a neon. And it being gone will not hurt a thing. There should be a resistor in series with it if it were a neon. So I think it's an AC outlet on the back. From looking at the diagram I would say the turn off "pop" is normal. I doubt it would blow a speaker. To reduce it, install an MOV across the primary of the transformer to clamp the turn off spike. V130LA10A or similar for 120 VAC circuits. -Chris

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