6550 Safety Question

Trout · 5th April 2006, 09:53 PM

Hi,

I was curious, I bought a bunch of Valve art 6550A's for these guitar amp projects.6550 Valve Art Picture

Anyway, I was looking at them, Double checking pin outs and discovered that Pin #8 and the metal base ring are connected?

Is this a safety issue?
I had planned on running spring style tube retainers and they come dangerously close to the metal base ring. If it were to contact the ring, wouldn't it defeat the resistor and bypass cap?
Also, Isn't this a shock hazard ?

Trout

poobah · 5th April 2006, 10:56 PM

Hey Gene,

I am looking at my very old Sylvania 6550's. On mine pin 1 is connected to the base ring and agrees with the tube data.

Are you sure you are looking at the right pin? Hold the tube with the bottom facing you and the key on the center post straight up at 12 o'clock. Pin munbering is 1 thru 8 clockwise starting with the first pin after the key.

weird...

Trout · 5th April 2006, 11:24 PM

Quote:

Originally posted by poobah
Hey Gene,

I am looking at my very old Sylvania 6550's. On mine pin 1 is connected to the base ring and agrees with the tube data.

Are you sure you are looking at the right pin? Hold the tube with the bottom facing you and the key on the center post straight up at 12 o'clock. Pin munbering is 1 thru 8 clockwise starting with the first pin after the key.

weird...

WHOOOOPS

Pin 1 is connected, I musta had a brain ***t

Trout

poobah · 6th April 2006, 02:02 PM

I was out fishing one morning on a nice little lake. I rowed my boat closer to an old man who was pulling them up one after the other... nice fat brown trout. He had his dog with him in the boat, half asleep with his chin resting on the bow. As he was reeling in yet another; he fumbled a bit and the fish slipped off the hook and went back into the lake. The guy looked over at me and said, "Good thing my dog didn't see that."

5th April 2006, 09:53 PM	#1
Trout diyAudio Member Join Date: Nov 2004 Location: Midwest Madman	6550 Safety Question Hi, I was curious, I bought a bunch of Valve art 6550A's for these guitar amp projects.6550 Valve Art Picture Anyway, I was looking at them, Double checking pin outs and discovered that Pin #8 and the metal base ring are connected? Is this a safety issue? I had planned on running spring style tube retainers and they come dangerously close to the metal base ring. If it were to contact the ring, wouldn't it defeat the resistor and bypass cap? Also, Isn't this a shock hazard ? Trout

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5th April 2006, 10:56 PM	#2
poobah diyAudio Member Join Date: Nov 2005	Hey Gene, I am looking at my very old Sylvania 6550's. On mine pin 1 is connected to the base ring and agrees with the tube data. Are you sure you are looking at the right pin? Hold the tube with the bottom facing you and the key on the center post straight up at 12 o'clock. Pin munbering is 1 thru 8 clockwise starting with the first pin after the key. weird...

6th April 2006, 02:02 PM	#4
poobah diyAudio Member Join Date: Nov 2005	I was out fishing one morning on a nice little lake. I rowed my boat closer to an old man who was pulling them up one after the other... nice fat brown trout. He had his dog with him in the boat, half asleep with his chin resting on the bow. As he was reeling in yet another; he fumbled a bit and the fish slipped off the hook and went back into the lake. The guy looked over at me and said, "Good thing my dog didn't see that."