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Author Topic: Gottlieb System 1 Speaker / Amp question  (Read 1581 times)

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Cyberflexx

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Gottlieb System 1 Speaker / Amp question
« on: November 17, 2008, 04:43:37 pm »
I noticed my speaker is an 8 ohm speaker.  Can the audio board handle a 4 ohm speaker or will this blow the amplifier?  i have the newer audio board in my BuckRogers if this helps.  I just wanted to replace the old ripped speaker for something a little better and the only one that I have available right now is 4ohms

Thanks

shardian

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #1 on: November 17, 2008, 04:48:25 pm »
I really don't know. The best person I can think to ask would be Pascal Janin. He knows the sys.1 hardware inside and out...and he answers emails!

I'll send you his email via pm.

shardian

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #2 on: November 17, 2008, 04:50:12 pm »
So it basically just goes in-line with the + lug?

Cyberflexx

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #3 on: November 17, 2008, 05:46:49 pm »
Or I could run two 4ohm speakers in series to make an 8ohm load on the amp.  I'll just go to radio shack and see what type of replacement speakers they have, if they still sell that kind of thing.  Radioshack has become nothing more than a glorified cell phone store  :angry:


Thanks for the information..  :notworthy:


Cyberflexx

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #4 on: November 17, 2008, 06:35:13 pm »
 cool.. thanks for the part number, Jim.  Looks like its in-stock at my local shack which really amazes me..

Blanka

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #5 on: November 18, 2008, 04:58:11 am »
It also depends on the amp. If it is a chip-amp, you don't need to worry, just connect it. They have current limiter safety circuits.
The thing is that every speaker, even 8 ohm ones, dip to 2 ohm now and then in bass parts. This is caused by the speaker generating current while moving back to the middle position. An amp has to deal with these resistance fluctuations. But if the amp is a classic transistor amp, you better use the extra resistor. Although you throw away half the power, and if you put up the volume, you end up using the same current for the same volume in the end, and the current is what kills the amp.

And you can also go down in resistance. Just put a resistor in parallel for that.
Two speakers in series is only OK when they are perfect the same species. If they are different models, they react different on the amp, and the return current generated will mess up the other of the 2 speakers.
« Last Edit: November 18, 2008, 05:02:00 am by Blanka »

shardian

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #6 on: November 18, 2008, 08:54:58 am »
I just thought of something else. The sound board you have in that game has a few irreplaceable chips - kind of like the CPU spider chips. Better not screw to much with it.

Cyberflexx

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #7 on: November 18, 2008, 09:30:46 am »
i just found a good 8ohm speaker that I am going to use..  It was in an old stereo that I am pitching out to the trash.  It's the same size that I needed.. What luck..

Ken Layton

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Re: Gottlieb System 1 Speaker / Amp question
« Reply #8 on: July 11, 2018, 01:59:31 am »
Updating this old thread. The Gottlieb system 1 and system 80 machines used a 6 inch 8 ohm full range speaker. Newark (formerly MCM Electronics) now sells a perfect replacement speaker at a very reasonable price:

http://www.newark.com/mcm-audio-select/55-5690/6-5-full-range-dual-cone-speaker/dp/95Y2940?ost=55-5690&scope=partnumberlookahead&exaMfpn=true&searchref=searchlookahead&ddkey=http%3Aen-US%2FElement14_US%2Fw%2Fsearch

Newark # 95Y2940 or MCM # 55-5690.

  
 

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