Acoustic 470 Guitar/Bass amp

unicorn · 10-27-2009, 02:04 PM

Hi, Could anyone please help point me to a readable circuit diagram for the Acoustic 470. Amp has been out of action for a few years and i dragged it out of the shed to check out for restoration. Still have the original bass cab with 2 x 15" Celestions.
Thanx

Phostenix · 10-27-2009, 03:31 PM

Check out this thread:
Acoustic 470 PA

unicorn · 10-27-2009, 03:59 PM

Hi Phostenix, I checked this one and found it to difficult to read, even spent time with my brother in a pic program to bring it up but no luck. I'll keep searching. ( I did consider building a different power amp stage but would rather keep it original)
Thanx

Phostenix · 10-27-2009, 04:29 PM

Are you having trouble reading it on screen with Acrobat Reader or when you print it? You could purchase the schematic from musicparts.com (their watermark is on the schematic). I have the Acoustic 370 set from them & it's very readable (split into two 8.5 X 11 pages). It also includes the service manual & parts list, etc.

$20 here (Paypal):
Acoustic*Schematics

gbono · 10-28-2009, 03:33 AM

unicorn,

Check out this site unofficial acoustic control corp forum - Message Board - Yuku

If you need a schemo I can email you one - just went through one of these so ask away if you have questions.

Phostenix · 10-28-2009, 04:47 AM

Quote:

Originally Posted by gbono

... just went through one of these so ask away if you have questions.

Did you get that working?

gbono · 10-28-2009, 05:35 AM

Yes, the PA board had a few issues but what threw me for the longest loop was the fact that I used replacement covers on the output devices (TO-3's mounted on the back chassis panel) that kept the collectors from making contact!!! I'm very familar with the design of this amplifier now

Phostenix · 10-28-2009, 06:40 AM

What covers do the output transistors have? I have a 370 that will be my next project (& another one on the way) and it looks like your basic TO-3 socket. The 470 must have different mounts, so I'm curious.

gbono · 10-28-2009, 06:12 PM

check out this link and scroll down until you see real pictures of a 470 - can't miss the covers on the EXPOSED output transistors. You do not have the same mounting scheme on a 370.

GuitarHeadOrBassHead470 < Acoustic < Wiki

Phostenix · 10-28-2009, 06:25 PM

Interesting. I'm not familiar with those covers.

10-27-2009, 02:04 PM	#1
unicorn Junior Member Join Date: Oct 2009 Posts: 2	Acoustic 470 Guitar/Bass amp Hi, Could anyone please help point me to a readable circuit diagram for the Acoustic 470. Amp has been out of action for a few years and i dragged it out of the shed to check out for restoration. Still have the original bass cab with 2 x 15" Celestions. Thanx

10-27-2009, 03:31 PM	#2
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 291	Check out this thread: Acoustic 470 PA __________________ ST in Phoenix

10-27-2009, 03:59 PM	#3
unicorn Junior Member Join Date: Oct 2009 Posts: 2	Acoustic 470 Hi Phostenix, I checked this one and found it to difficult to read, even spent time with my brother in a pic program to bring it up but no luck. I'll keep searching. ( I did consider building a different power amp stage but would rather keep it original) Thanx

10-27-2009, 04:29 PM	#4
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 291	Are you having trouble reading it on screen with Acrobat Reader or when you print it? You could purchase the schematic from musicparts.com (their watermark is on the schematic). I have the Acoustic 370 set from them & it's very readable (split into two 8.5 X 11 pages). It also includes the service manual & parts list, etc. $20 here (Paypal): Acoustic*Schematics __________________ ST in Phoenix

10-28-2009, 06:40 AM	#8
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 291	What covers do the output transistors have? I have a 370 that will be my next project (& another one on the way) and it looks like your basic TO-3 socket. The 470 must have different mounts, so I'm curious. __________________ ST in Phoenix

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10-28-2009, 03:33 AM	#5
gbono Senior Member Join Date: Aug 2007 Posts: 166	unicorn, Check out this site unofficial acoustic control corp forum - Message Board - Yuku If you need a schemo I can email you one - just went through one of these so ask away if you have questions.

10-28-2009, 05:35 AM	#7
gbono Senior Member Join Date: Aug 2007 Posts: 166	Yes, the PA board had a few issues but what threw me for the longest loop was the fact that I used replacement covers on the output devices (TO-3's mounted on the back chassis panel) that kept the collectors from making contact!!! I'm very familar with the design of this amplifier now

10-28-2009, 06:12 PM	#9
gbono Senior Member Join Date: Aug 2007 Posts: 166	check out this link and scroll down until you see real pictures of a 470 - can't miss the covers on the EXPOSED output transistors. You do not have the same mounting scheme on a 370. GuitarHeadOrBassHead470 < Acoustic < Wiki

10-28-2009, 06:25 PM	#10
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 291	Interesting. I'm not familiar with those covers. __________________ ST in Phoenix

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