Ampex 6446 Cinemascope amplifiers

[Potato_Head]

Is there anyone out there that has experience with the Ampex 6446 tube amplifiers?

I am in need of schematics and impedance information.

Thank you

 

[Potato_Head]

Does anyone have any information on the Ampex 6446 Cinemascope amplifiers?

I just found two. They sound good but I need to know what impedance they are for better speaker matching.

Thank you

Ampex 6556 violet and neon

• Potato_Head
• Jan 30, 2017

Nice Glow

Ampex 6556

• Potato_Head
• Jan 30, 2017

 

[turnitdown]

Wow!

 

[radioactive]

You aur you have the model number right? How about 6446?
http://www.radiomuseum.org/r/ampex_6446.html

 

[radioactive]

200w each amp nice

 

[Potato_Head]

oops! Typo Yes 6446!

 

[Potato_Head]

You aur you have the model number right? How about 6446?
http://www.radiomuseum.org/r/ampex_6446.html

Thanks for the catch. I found that page earlier. Just a late typo! Is there a way to edit the subject line of a post?

 

[Potato_Head]

Sorry for the typos the amps are 6446

 

[Leland47]

Yes, I believe so.
Choose Edit....then select "more options" ...it should be under that

 

[Tinkerbelle]

Updated for you if that's what you wanted

 

[Potato_Head]

Updated for you if that's what you wanted

That is great! Can you edit my other threads too?

 

[atltech]

Potato_Head? .....RC

 

[whoaru99]

Pictures of the connections?

 

[toxcrusadr]

Those look beastly.

 

[lordgarth]

Hey potato Head, send them to my house & I'll get back to you in a couple of years.

 

[toxcrusadr]

They've certainly got the iron to be great hi fi amps from the looks of it. I don't think I've ever seen one of these here, and I'm a bit of an Ampex fan.

 

[toxcrusadr]

If you can get the SAM's folder number - which Google will have or Radiomuseum - perhaps Tom Bavis will show up and tell you if he has it.

 

[Potato_Head]

Potato_Head? .....RC

Yup - It's me!

Hows the HK and Pioneer coming along?

Michael

 

[Potato_Head]

Pictures of the connections?

Hello,

Part of the customized work that was done was to change the amps from a vertical orientation (transformers as the base) to a traditional horizontal position. The connections on the back are a simple RCA jack for input and then a single pair of speaker terminals. The bias meter and switch was then moved to the new front of the amp (old top). I'm guessing that if there were different taps on the output transformer they will be underneath the chassis.

Here is the reason for the modifications. http://www.radiomuseum.org/r/ampex_6446.html

Definitely not home use friendly. I would not want to have this where curious fingers could find high voltage.

Michael

 

[Potato_Head]

Here are some new pictures of the underside of the amp. Does anyone know how the output transformer should be wired for 4,8,16 ohms? I am wondering what impedance the amp is set up for now. Thank you - Michael

IMG_7190 ampex 6446 output transformer

• Potato_Head
• Feb 6, 2017

Is it wired for 4,8 or 16 ohms? Looks like it had been wired for all three at one time.

IMG_7193 ampex 6446 close up

• Potato_Head
• Feb 6, 2017

IMG_7188 Ampex 6446 rectifier?

• Potato_Head
• Feb 6, 2017

IMG_7187 Ampex 6446 807 output tube wiring

• Potato_Head
• Feb 6, 2017

IMG_7182 Ampex 6446 second capacitor board

• Potato_Head
• Feb 6, 2017

IMG_7184 Ampex 6446 main capcitor board

• Potato_Head
• Feb 6, 2017

IMG_7183 ampex 6446 bias meter selector and 2 bias controls

• Potato_Head
• Feb 6, 2017

IMG_7191 Ampex 6446 choke?

• Potato_Head
• Feb 6, 2017

This is the box between the Power and output transformer.

IMG_7188 Ampex 6446 rectifier?

• Potato_Head
• Feb 6, 2017