Discussion:
ROCK-OLA 494
(too old to reply)
w***@gmail.com
2019-02-27 21:57:01 UTC
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How do you adjust the volume???
John Robertson
2019-02-28 15:48:38 UTC
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Post by w***@gmail.com
How do you adjust the volume???
Rear of the machine, usually right behind the amplifier (open the front
to find that). It is most likely a 3/8 to 1/2" long shaft with a slot.
And very close to the slide cancel (reject record) switch.

John :-#)#
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(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
w***@gmail.com
2019-02-28 22:57:41 UTC
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John thanks I found it earlier. I have another problem on this 494 I just finished up. The sound is very tinny. like it's out of phase or something. Like very high distorted treble. I tried different speakers with no change. Replaced the needle with a new good Shure. What are your thoughts on the cartridge being bad? It's wired correctly. If that's not the problem then the amp is going to need re-built. Your thoughts? Thanks!
John Robertson
2019-03-01 00:05:43 UTC
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Post by w***@gmail.com
John thanks I found it earlier. I have another problem on this 494 I just finished up. The sound is very tinny. like it's out of phase or something. Like very high distorted treble. I tried different speakers with no change. Replaced the needle with a new good Shure. What are your thoughts on the cartridge being bad? It's wired correctly. If that's not the problem then the amp is going to need re-built. Your thoughts? Thanks!
I believe that is a magnetic cartridge and thus is very unlikely to go
bad. As long as the stylus is the correct one for your cartridge then
chances are the amp is needing a recap.

John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
Norman Macrae
2019-03-10 17:44:49 UTC
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Post by w***@gmail.com
John thanks I found it earlier. I have another problem on this 494 I just finished up. The sound is very tinny. like it's out of phase or something. Like very high distorted treble. I tried different speakers with no change. Replaced the needle with a new good Shure. What are your thoughts on the cartridge being bad? It's wired correctly. If that's not the problem then the amp is going to need re-built. Your thoughts? Thanks!
It could well be out of phase, the cartridge in these should be wired out of phase like AMIs - when you say the cartridge is wired correctly, is that as per diagram?
w***@gmail.com
2019-03-11 00:15:45 UTC
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Post by Norman Macrae
Post by w***@gmail.com
John thanks I found it earlier. I have another problem on this 494 I just finished up. The sound is very tinny. like it's out of phase or something. Like very high distorted treble. I tried different speakers with no change. Replaced the needle with a new good Shure. What are your thoughts on the cartridge being bad? It's wired correctly. If that's not the problem then the amp is going to need re-built. Your thoughts? Thanks!
It could well be out of phase, the cartridge in these should be wired out of phase like AMIs - when you say the cartridge is wired correctly, is that as per diagram?
I have an AMI as well and the cartridge is wired out of phase. On this Rock-Ola it's not wired out of phase as per the manual instructions. The amp needed re-built. It's all back together and sounds good now. Not as good as my AMI but as good as a Rock-Ola.
Norman Macrae
2019-03-11 09:49:57 UTC
Permalink
Post by w***@gmail.com
Post by Norman Macrae
Post by w***@gmail.com
John thanks I found it earlier. I have another problem on this 494 I just finished up. The sound is very tinny. like it's out of phase or something. Like very high distorted treble. I tried different speakers with no change. Replaced the needle with a new good Shure. What are your thoughts on the cartridge being bad? It's wired correctly. If that's not the problem then the amp is going to need re-built. Your thoughts? Thanks!
It could well be out of phase, the cartridge in these should be wired out of phase like AMIs - when you say the cartridge is wired correctly, is that as per diagram?
I have an AMI as well and the cartridge is wired out of phase. On this Rock-Ola it's not wired out of phase as per the manual instructions. The amp needed re-built. It's all back together and sounds good now. Not as good as my AMI but as good as a Rock-Ola.
OK, the previous models (490 series) the cartridge is wired out of phase and the 12 inch loudspeakers sum the two output channels as per AMI. It's the same amp (54510-A) that's used, strange that Rock-Ola should change back. I must confess I don't have a 494 manual though.
w***@gmail.com
2019-03-11 17:11:56 UTC
Permalink
Post by Norman Macrae
Post by w***@gmail.com
Post by Norman Macrae
Post by w***@gmail.com
John thanks I found it earlier. I have another problem on this 494 I just finished up. The sound is very tinny. like it's out of phase or something. Like very high distorted treble. I tried different speakers with no change. Replaced the needle with a new good Shure. What are your thoughts on the cartridge being bad? It's wired correctly. If that's not the problem then the amp is going to need re-built. Your thoughts? Thanks!
It could well be out of phase, the cartridge in these should be wired out of phase like AMIs - when you say the cartridge is wired correctly, is that as per diagram?
I have an AMI as well and the cartridge is wired out of phase. On this Rock-Ola it's not wired out of phase as per the manual instructions. The amp needed re-built. It's all back together and sounds good now. Not as good as my AMI but as good as a Rock-Ola.
OK, the previous models (490 series) the cartridge is wired out of phase and the 12 inch loudspeakers sum the two output channels as per AMI. It's the same amp (54510-A) that's used, strange that Rock-Ola should change back. I must confess I don't have a 494 manual though.
This box came with all the papers. Even the inspectors check list before it left the factory. When I was having sound problems I compared it to my AMI and thought I'd found the problem. Then I looked in the manual to double check and saw it was wired correctly not like the AMI. After the amp re-build it sounds good but my AMI sounds so much better.
w***@gmail.com
2019-03-01 10:46:09 UTC
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Do you have a cap kit for a 54510-A amp?
John Robertson
2019-03-01 18:41:57 UTC
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Post by w***@gmail.com
Do you have a cap kit for a 54510-A amp?
If you are talking to me - it would be help to quote the previous
message so I know what you are talking about.

We do not have a cap kit, check out verntisdale.com as I think they do.
If you can't find it there, then email me and we shall wee what we can
put together for you. The reply-to email address is valid...

John ;-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
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