Moto chassis pulled! pics!

ghola · 5th March 2006, 03:22 PM

I removed the chassis from my Moto 7F-11. All tubes lit up except Sylvania 7Z4. In one pic you can see odd white deposit (buildup?) on underside. This may or may not be OK. 7Z4 tube has only 5 pins, and one looks bent. Is this normal? Also, since Im not a tech, to convert this into a guitar amp: is it feasible to bring to qualified tech? Is it a difficult mod? I own an a.r.t. tube pre amp, which is good for guitar. I would like to use them together. If I did, would I bypass pre on Moto, or use both? Is there any audio application for Moto tuner section, or is that useless in a guitar amp?
Try this link for pics:

http://photos.yahoo.com/timington

Tom Bavis · 5th March 2006, 03:42 PM

You'll need a schematic - it's covered in Sams photofact folder # 113-5 - you may be abe to get it through your library for copy cost or through many online sellers (Direct from Sams will be $25 - much less elsewhere)

7Z4 can be bought cheaply, though it's not common - I have ONE, so I trhink I'll keep it - you can change the socket and use 6X5 or 6AX5, which are much easier to find...

There's not enough gain for a guitar amp - you can use an external preamp or use some of the tuner tube sockets to build in your own.

Looks like push-pull 6V6s, so it's probably 10-12 watts output.

5th March 2006, 03:22 PM	#1
ghola diyAudio Member Join Date: Feb 2006 Location: Maine	Moto chassis pulled! pics! I removed the chassis from my Moto 7F-11. All tubes lit up except Sylvania 7Z4. In one pic you can see odd white deposit (buildup?) on underside. This may or may not be OK. 7Z4 tube has only 5 pins, and one looks bent. Is this normal? Also, since Im not a tech, to convert this into a guitar amp: is it feasible to bring to qualified tech? Is it a difficult mod? I own an a.r.t. tube pre amp, which is good for guitar. I would like to use them together. If I did, would I bypass pre on Moto, or use both? Is there any audio application for Moto tuner section, or is that useless in a guitar amp? Try this link for pics: http://photos.yahoo.com/timington

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5th March 2006, 03:42 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	You'll need a schematic - it's covered in Sams photofact folder # 113-5 - you may be abe to get it through your library for copy cost or through many online sellers (Direct from Sams will be $25 - much less elsewhere) 7Z4 can be bought cheaply, though it's not common - I have ONE, so I trhink I'll keep it - you can change the socket and use 6X5 or 6AX5, which are much easier to find... There's not enough gain for a guitar amp - you can use an external preamp or use some of the tuner tube sockets to build in your own. Looks like push-pull 6V6s, so it's probably 10-12 watts output.

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