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General Discussion / Re: Eight Ohm Amplifier on Four Ohm Speakers
« Last post by Cary on April 06, 2024, 07:31:08 AM »Thanks Dan! Wishing you and Eileen our bests.
Recent Posts
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General Discussion / Re: Eight Ohm Amplifier on Four Ohm Speakers
« Last post by Doc B. on April 06, 2024, 07:05:21 AM »Distortion will be a little lower using the 4 ohm output and bass is often a little tighter than it would be using the 8 ohm output on 4 ohm speakers. It depends a lot on the speaker used. You can try both ways and see what you like without causing any issues.
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General Discussion / Eight Ohm Amplifier on Four Ohm Speakers
« Last post by Cary on April 06, 2024, 06:52:38 AM »My Bottlehead amplifiers are wired for eight ohms, if I connect four ohms speakers with them would there be any difference in sound quality if my amps were wired for four ohms?
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Moreplay / Re: Timothy C’s Moreplay Build
« Last post by timmieec on April 06, 2024, 05:58:33 AM »Audio circuit is done and connectivity tests seem to check out.
On to input wiring tomorrow!
On to input wiring tomorrow!
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Eros Phono / Re: 1A/1B reading 100v
« Last post by Paul Joppa on April 06, 2024, 04:56:55 AM »Ten dB is about 70% less voltage, not 20%. The gain of the two triodes in a 6922 might possibly vary by as much as 20%, but not 70%!
I see two choices - either gather more data (measure gain at several frequencies), or just try refreshing all the solder joints. Personally I'd start with those on the eq network tag strip.
I see two choices - either gather more data (measure gain at several frequencies), or just try refreshing all the solder joints. Personally I'd start with those on the eq network tag strip.
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Eros Phono / Re: 1A/1B reading 100v
« Last post by Brooklynbottle on April 06, 2024, 02:23:39 AM »Reading through @caderette, perhaps my 6922 is the source the channel imbalance? Switching the 86's didn't change the discrepancy.
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Moreplay / Re: Timothy C’s Moreplay Build
« Last post by timmieec on April 05, 2024, 09:26:29 PM »Thank you everyone for the guidance! Good to know that I don’t need to worry about loss of performance or reliability and can proceed with the build 
Next up, audio circuit wiring!
Next up, audio circuit wiring!
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Moreplay / Re: Timothy C’s Moreplay Build
« Last post by Paul Joppa on April 05, 2024, 07:55:46 PM »So-called "230v" power grids combine/compromise the older standards of 220v and 240v, but many of the older generators are still in use. For this reason, the Moreplay power transformer can be set for 220 or 240 - but not for 230. I think that gives our customers a better chance of getting close to optimum power. That means that Timmie's voltages are only 1% high. The circuit can withstand +/-10% variation without loss of performance or reliability.
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Moreplay / Re: Timothy C’s Moreplay Build
« Last post by hmbscott on April 05, 2024, 07:34:19 PM »Your line voltage is about 5% high, so you can expect your B+ to also be about 5% high, which means it will fall within a range of 295 - 335 VDC, and it does. So I don't think there's anything wrong with your wiring, it's your high line voltage. I can't say if it's OK or not.
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Moreplay / Re: Timothy C’s Moreplay Build
« Last post by timmieec on April 05, 2024, 05:58:00 PM »Help! 
I'm failing the raw B+ voltage test. I repeated the test 3 times and got the following peak VDC read outs: 331.2, 330.7, 331.1. The spec is 280 - 320V.
I've checked all the wiring for connectivity using my DMM and it seems like everything that's supposed to be connected passes the connectivity test. I've also confirmed the polarities of the caps and diodes are correct.
Could my raw B+ voltage be exceeding 320V because, as @Paul Birkeland noted, my mains voltage is so high (245VAC)?
Or is it definitely failing the test because of a workmanship error? If it's definitely workmanship, any advice on what else I should check besides polarity and connectivity?
The cap connected across terminals 23 and 21 is rated for 350V so there's low risk to that component. But I don't know whether the components being supplied by this DC voltage will be okay receiving 331V...
Any guidance would be much appreciated!
I'm failing the raw B+ voltage test. I repeated the test 3 times and got the following peak VDC read outs: 331.2, 330.7, 331.1. The spec is 280 - 320V.
I've checked all the wiring for connectivity using my DMM and it seems like everything that's supposed to be connected passes the connectivity test. I've also confirmed the polarities of the caps and diodes are correct.
Could my raw B+ voltage be exceeding 320V because, as @Paul Birkeland noted, my mains voltage is so high (245VAC)?
Or is it definitely failing the test because of a workmanship error? If it's definitely workmanship, any advice on what else I should check besides polarity and connectivity?
The cap connected across terminals 23 and 21 is rated for 350V so there's low risk to that component. But I don't know whether the components being supplied by this DC voltage will be okay receiving 331V...
Any guidance would be much appreciated!