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Post by JumpMarine on Jun 26, 2009 19:49:48 GMT -7
For instance, why does my RX Jr sound more spongy with the stock NOS 5y3 than the old big bottle Silvertone 5y3 that I currently have in there?
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Post by Deleted on Jun 27, 2009 20:57:36 GMT -7
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Post by JumpMarine on Jun 28, 2009 11:56:12 GMT -7
Thanks alot, that explains a lot and Myles' site is great. I guess where I was going with this is that when I swap my stock NOS 5y3 for an old Silvertone 5y3 the lowend tightens up and the top end warms a bit. It's no less touch sensitive than before.
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Post by Deleted on Jun 28, 2009 16:21:56 GMT -7
Sounds like a keeper, if that's what you're looking for.
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Post by Telemanic on Jun 29, 2009 11:23:59 GMT -7
It goes directly into the whole area of why any one tube sounds different from another. Material differences, design differences, as well as electrical characteristics that those variables produce.
A rectifier is the simplest of tubes being a diode, meaning only 2 elements in it. It simply rectifies the AC current from the power transformer into DC, which powers the amp circuit. They do no work, or in other words they dont operate like a "valve" ie power tubes, pre tubes etc. But, because of the design differences they do have differing reactions in regard to a sense of "time", which translates into "feel". It is quite normal for one tube to feel spongier while another feels firmer. Tight or loose would be another set of descriptions that are similar to me as well as hard or soft. The beauty is that all you have to do is decide which it is that suits you best! Remember though unless your amp is self biasing, ya technically should check the bias on the output section. Probably would be close enough for Gov. work, but good to check it anyway as they can vary as to the voltage they supply to the B+ supply. Happy hunting!!!
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Post by myles on Jul 1, 2009 18:48:35 GMT -7
If you see a difference with different 5Y3's that is not unexpected. Rectifiers just like tubes vary widely. You can measure plate voltage and see if there is a difference but you will also have to measure voltage drop under load.
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