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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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PostPosted: 21 Oct 2013, 04:34 
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Joined: 21 Oct 2013, 04:21
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Please help on this (sony cdx-gt44u cd receiver)?

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PostPosted: 22 Oct 2013, 22:34 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, Based on the configuration of the 8 pin connector and the description I wonder if the speaker connections are actually not ground based, but bridged outputs. If so you would need to run both the + and the - to each speaker. This type of bridged output is fairly common in solid state equipment as it will allow for approximately 4 times the power output when compared to a standard output with the same power supply voltage. Very handy for automobile uses where the supply voltage is only 12-15 volts.

Regardless, it appears that pins 1,3,5,7 are the hot pins and 2,4,6,8 the negative. If the unit does not have the bridged output configuration then I would expect you could hook pins 2 and 4 together (on the barrel of the jack) and 1 and 3 on the tip and second segment. Then 6 and 8 together on the other jack's barrel and 5 and 7 on the tip and second segment respectively.

It is sometimes possible to tell if the amp has the bridged vs standard output. Using a digital meter measure the resistance between pins 2 and 4 and 6 and 8. If it is anything over a near zero value then it is likely a bridged configuration. If it is essentially zero (check you meter by shorting the probes together to get a base reading on it as the probes will have some resistance) then probably the outputs are ground or common referenced.

Good listening
Bruce

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