What-watt Posted January 5 Share Posted January 5 Kindly asking for advice, Single-ended circuit, the sound warm and sweet, full and mellow, much softer and more listenable. Pluggable tube socket design, 6N4 can be replaced by 12AX7, 7025, 5751, ECC83 etc. and 6P3P can be replaced by 6L6, 5881, EL34A, EL34B, 6CA7 etc., adding much fun and higher playability Sorry, KT66 and KT88 are not supported Notice: the filament power supply voltage is 12.6V, 6N4 cannot be replaced by the vacuum tubes whose filament power supply voltage is 6.3V such as 6AY11 KT66 is equivalent of 6v6? anyway, is there a way, that i could swap transfo, so it would accept all tube? 1 Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted January 5 Share Posted January 5 It looks like you have plenty of choices. First, why tube roll- better/different sound. Tubes in the same family such as Sylvania, Tung-Sol, etc generally sound the same. Using something like a 7n7 vs 6SN7 may have a slightly different sound than a Sylvania 6SN7 being from a different family. There are also substitutes like the 6GU7. Note, the 6GU7 and 7N7 are just the 9 and 7 pin electrical equivalents and no concern of filament voltage. Tube rolling can be fun but know your amp circuitry. Tube adapters are available on the internet. The adapters usually just convert sockets and not filament. It is possible to roll a lot of tubes in an amp but, if the tube is not operating in its optimal range, no improvement in SQ most likely. What is your amp and other gear? It may help to get others to chime in. Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted January 6 Share Posted January 6 Without knowing more about your amp and setup, for now, my answer is no to using a KT 66 in place of a 6v6 that the amp may have been designed for. The KT 66 is a stronger power tubes, pin configuration may not work, and the bias requirements between the two tubes, 8v8 and KT 66 are significantly different. Damaged amp, damaged tube and poor performance is a likely reward. The SQ is not based on tube size or power. An El 84 can sound as good as a 300b in the right setting. The key is to build a system that fits you and not end up with a bunch of gear and excess tubes sitting around. Quote Link to comment Share on other sites More sharing options...
82 Cornwalls Posted January 6 Share Posted January 6 @What-watt What amplifier are you asking about? Odd that it can use EL34/6CA7 and not a KT66. KT66 is not always a direct replacement for a 6L6 because it has more filament/heater draw, but it is less than EL34/6CA7/KT77 and the KT88 only draws 0.1A more. A tube amplifier can not be optimized for multiple tube types, it a marketing thing. 1 Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 6 Author Share Posted January 6 ok, thanks, to complicated for me, just bought a A300 harman, with 7408, 6v6 kind of, don't know if on that one, i will be able to use my 6L6 or El34, any clue, what replace the 7408 in a A300? thanks for helping the other is a 5watts, doug audio tube amp, sound superbe with china coca-cola bottle tube, but my goal was to swap tube, but i didn't do nothing just listen so far the way it is, till manufacturer reply to me. Also spotted, a unison 2xel34, more modern, but 2k$ even in CAD$ is a bit too much for me..! 1 Quote Link to comment Share on other sites More sharing options...
82 Cornwalls Posted January 6 Share Posted January 6 HK A300 6V6 only. Douk Audio? KT66 should work. The amplifier is so small I assume it has a smps. 6N4 is a Rus/Chi tube with a 12.6v heater/filament, not a 6.3v like the US tube. Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 7 Author Share Posted January 7 could modify a300 for EL34? was it worth it? or best 6v6, affordable? would be? thanks for helping! this? https://iwistao.com/products/shuguang-vacuum-tube-6p6p-inventory-product-straight-replacement-tubes-6v6gt-6n6c?_pos=4&_sid=43aea2e43&_ss=r Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 7 Author Share Posted January 7 4 hours ago, 82 Cornwalls said: HK A300 6V6 only. Douk Audio? KT66 should work. The amplifier is so small I assume it has a smps. 6N4 is a Rus/Chi tube with a 12.6v heater/filament, not a 6.3v like the US tube. smps??? so 6.3 kt66 won't work? overheat and blew? Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted January 7 Share Posted January 7 Stick with good quality tubes made for the amp. Rolling most likely won't offer you any better SQ. Your tubes are your amp and good ones should sound great. 1 Quote Link to comment Share on other sites More sharing options...
82 Cornwalls Posted January 7 Share Posted January 7 1 hour ago, What-watt said: smps??? so 6.3 kt66 won't work? overheat and blew? Switched mode power supply instead of a traditional transformer based power supply that most tube amplifiers have. 6N4 (Chinese tube) is the small input tube and it has a 12.6v filament, see your first post. 6P3P (6L6G) is the larger power tube. I would suggest trying to learn more about tubes by looking at tube data sheets and other resources. The HK A300 can not be modified to use anything but a 6V6. If you want an EL34 amplifier buy an EL34 amplifier. A good tube amp design with basic tubes sounds better than a bad design with the "flavor of the month" tube. 1 Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 7 Author Share Posted January 7 thanks, so 6v6 now on the market will be? Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 7 Author Share Posted January 7 15 hours ago, 82 Cornwalls said: Switched mode power supply instead of a traditional transformer based power supply that most tube amplifiers have. 6N4 (Chinese tube) is the small input tube and it has a 12.6v filament, see your first post. 6P3P (6L6G) is the larger power tube. I would suggest trying to learn more about tubes by looking at tube data sheets and other resources. The HK A300 can not be modified to use anything but a 6V6. If you want an EL34 amplifier buy an EL34 amplifier. A good tube amp design with basic tubes sounds better than a bad design with the "flavor of the month" tube. 6n4=12ax7 and 6p3p is 6L6 or EL34, ok understood, so 12au7 will check the spec sheet! Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 7 Author Share Posted January 7 15 hours ago, 82 Cornwalls said: Switched mode power supply instead of a traditional transformer based power supply that most tube amplifiers have. 6N4 (Chinese tube) is the small input tube and it has a 12.6v filament, see your first post. 6P3P (6L6G) is the larger power tube. I would suggest trying to learn more about tubes by looking at tube data sheets and other resources. The HK A300 can not be modified to use anything but a 6V6. If you want an EL34 amplifier buy an EL34 amplifier. A good tube amp design with basic tubes sounds better than a bad design with the "flavor of the month" tube. so changing the power supply, will be great thing for an upgraded, ok i just put it for sale at 275$CAD on cam, so it won't stay there long, l'll guess and than stay with 6v6 like a mullard or EH? Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 7 Author Share Posted January 7 https://www.thetubestore.com/search?keywords=6v6 where do i start with? Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted January 7 Share Posted January 7 They are a long and trusted dealer with good quality tubes. 1 Quote Link to comment Share on other sites More sharing options...
KT88 Posted January 9 Share Posted January 9 @What-watt Playing around with your tubes is certainly part of the hobby. But honestly, as others have said, stick with the tubes your amp is made for. If you don't like the sound after two months, then change the tubes very carefully, only the tubes of one function at a time, not several at the same time. In the meantime, you can learn which other tubes are electrically suitable and which are not. The line between fine tuning and disaster can be very thin. Quote Link to comment Share on other sites More sharing options...
82 Cornwalls Posted January 9 Share Posted January 9 There are perhaps many tube rollers, but not all tube amp owners do. Tube rollers get all the attention because non rollers don't have much to discuss. 😉 Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 9 Author Share Posted January 9 ok, thanks 5watts, wasn't enough, but sound is ok, i think tube could sound more fun, and 10/20 watts, could be better. i guess, i miss the sound of my old sophia EL34, or my HK prelude EL84 first purchase in tube, didn't know i hit the jackpot at first attempt. since them, just searching that sound in tube or in an amp. So going back, to the a300 6v6, improve my chance of satisfaction, if the transporter, is not to hard on it! thanks for helping! Yeah, what to discuss, when everything work fine! like a klipsch speaker! Quote Link to comment Share on other sites More sharing options...
82 Cornwalls Posted January 10 Share Posted January 10 Sometimes things just sound different, not better or worse, and we often need time to adjust to the new sound and find things we like about it. EL84 amps usually sound good and some even say it's hard to make a bad sounding EL84 amplifier. Quote Link to comment Share on other sites More sharing options...
What-watt Posted January 13 Author Share Posted January 13 vivatube, say 5871 are ok on 6v6 amplifier??? Quote Link to comment Share on other sites More sharing options...
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