Members Mr Songwriter Posted May 13, 2011 Members Share Posted May 13, 2011 I've just seen an article about this amp (Laney Lionheart 50) in a guitar mag, it's not out yet but I was wondering if there was any benefit to using five EL34's (the only downside I can think of is that matched power tubes are not normally sold in that quantity) Anyone know anything about this type of amp? [video=youtube;-AvXFlWEeHQ] Link to comment Share on other sites More sharing options...
Members Zozobra Posted May 13, 2011 Members Share Posted May 13, 2011 I would guess that its some sort of single ended amp with a frigging huge OT rather than your typical push pull power amp? Link to comment Share on other sites More sharing options...
Members Cougar Hunter Posted May 13, 2011 Members Share Posted May 13, 2011 If there are five tubes, I'm guessing they wouldn't need to be matched. You can't do a push/pull A/B power block with an odd number of tubes. Cathode Biased, maybe? sounds like a cool amp, either way. Link to comment Share on other sites More sharing options...
Members jenksdrummer Posted May 13, 2011 Members Share Posted May 13, 2011 That or it could use an EL34 as a driver, I think.... Link to comment Share on other sites More sharing options...
Members Dolf Posted May 13, 2011 Members Share Posted May 13, 2011 wat Link to comment Share on other sites More sharing options...
Members -Assy- Posted May 13, 2011 Members Share Posted May 13, 2011 Can't wait to try this amp. As well as the Ironheart. Link to comment Share on other sites More sharing options...
Members tech21man Posted May 13, 2011 Members Share Posted May 13, 2011 I don't know where the problem is. It says in the end it is a parallel single ended up. It could have 3 or 7 or whatever tubes... Link to comment Share on other sites More sharing options...
Members Wyatt Posted May 13, 2011 Members Share Posted May 13, 2011 It says right there in the video....parallel single-ended operation. For all intents and purposes, there are five power amps in one amp driving one output... each EL34 will be part of its own SE power amp, each with its own bias setup (being single-ended, they will be cathode-biased, and will NOT need to be matched), and its own output transformer (in this case, probably just its own OT primary coil), each generating about 10-watts dissipation. (tech21man beat me to it) Link to comment Share on other sites More sharing options...
Members bass_n_drums Posted May 13, 2011 Members Share Posted May 13, 2011 i'am excited!!! Link to comment Share on other sites More sharing options...
Members Mr Songwriter Posted May 13, 2011 Author Members Share Posted May 13, 2011 Ah thanks, so what is the advantage of this design? less crossover distortion? Link to comment Share on other sites More sharing options...
Members Dolf Posted May 13, 2011 Members Share Posted May 13, 2011 It says right there in the video....parallel single-ended operation. For all intents and purposes, there are five power amps in one amp driving one output... each EL34 will be part of its own SE power amp, each with its own bias setup (being single-ended, they will be cathode-biased, and will NOT need to be matched), and its own output transformer (in this case, probably just its own OT primary coil), each generating about 10-watts dissipation. (tech21man beat me to it) in which case it seems to me like they are barely working the tubes, no? Link to comment Share on other sites More sharing options...
Members C-4 Posted May 13, 2011 Members Share Posted May 13, 2011 I have always loved power tube saturation in amps and have wanted to hear an amp that would offer it up along with pre amp saturation, but in the desired amounts that I prefer of each. This gets into the original Marshall plexi tones when run full up. Far better then mere preamp saturation only.This amp looks really interesting! Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted May 13, 2011 Members Share Posted May 13, 2011 in which case it seems to me like they are barely working the tubes, no? No...running tubes in true Class A makes them less efficient. You need more of them to get the same power when you're pushing them just as hard. Link to comment Share on other sites More sharing options...
Members ruppert240 Posted May 13, 2011 Members Share Posted May 13, 2011 I've built a few SE amps and they are fun, but I don't think I would be interested in a high powered one. the lionheart 20 is paralell SE and sounds pretty good though. Link to comment Share on other sites More sharing options...
Members timmyfirst Posted May 13, 2011 Members Share Posted May 13, 2011 Believe me guys, this amp is killer and i've never heard an amp with such awesome volume control. Link to comment Share on other sites More sharing options...
Members FastRedPonyCar Posted May 13, 2011 Members Share Posted May 13, 2011 Meh, I'll wait for the 200 watt version with 20 power tubes Link to comment Share on other sites More sharing options...
Members Rampage Posted May 13, 2011 Members Share Posted May 13, 2011 ZERO crossover distortion. You also preserve the even-order harmonics that push-pull power sections cancel.No...running tubes in true Class A makes them less efficient.You need more of them to get the same power when you're pushing them just as hard. Enough of this even-order harmonic bull{censored}. What I want to know is whether or not this thing has the fragile harmonics. Link to comment Share on other sites More sharing options...
Members -Assy- Posted May 13, 2011 Members Share Posted May 13, 2011 8=====D for this amp. Link to comment Share on other sites More sharing options...
Members timmyfirst Posted May 13, 2011 Members Share Posted May 13, 2011 Enough of this even-order harmonic bull{censored}. What I want to know is whether or not this thing has the fragile harmonics. They are so fragile that even the lattice will want to copulate. Link to comment Share on other sites More sharing options...
Members Wyatt Posted May 13, 2011 Members Share Posted May 13, 2011 ZERO crossover distortion. You also preserve the even-order harmonics that push-pull power sections cancel.No...running tubes in true Class A makes them less efficient.You need more of them to get the same power when you're pushing them just as hard. +1. Unfortunately, hum is also a common side-effect of must SE designs due to "feedthrough" where the power tube's heaters affect its cathode. It can be corrected for but most amp makers skip that step (the easiest way is a hum balance pot, but that can be screwed up by end-users, so it's best not to give them the opportunity). Link to comment Share on other sites More sharing options...
Members bdubbs Posted May 13, 2011 Members Share Posted May 13, 2011 Tube makers rejoice Link to comment Share on other sites More sharing options...
Members newholland Posted May 13, 2011 Members Share Posted May 13, 2011 That or it could use an EL34 as a driver, I think.... i've actually seen this in other power amps-- usually lower wattage though- like for a pair of 300b tubes. EDIT: der.. already covered this ground in the thread.. which i didn't read. til now. now if they'd run the preamp witn 6sn7's, you'd have the whole single ended hifi approach hammered.. things gotta have some lovely midrange goin on. i'd love to check this thing out, and i'd watch the vid if i weren't at work. Link to comment Share on other sites More sharing options...
Members PaoloJM Posted May 13, 2011 Members Share Posted May 13, 2011 +1.Unfortunately, hum is also a common side-effect of must SE designs due to "feedthrough" where the power tube's heaters affect its cathode. It can be corrected for but most amp makers skip that step (the easiest way is a hum balance pot, but that can be screwed up by end-users, so it's best not to give them the opportunity). The biggest hum related problem is the fact that single ended designs have 0 CMRR. Push pull cancels most of it's noise by design, SE does not. Link to comment Share on other sites More sharing options...
Members lenster Posted May 14, 2011 Members Share Posted May 14, 2011 Believe me guys, this amp is killer and i've never heard an amp with such awesome volume control. Very intrigued by this amp, more than any other at the moment. Tell me , your comparison with VH100R, GH50. This could well be my next amp if its as good or better than my VH100R. Link to comment Share on other sites More sharing options...
Members Y0UNGBL00D Posted May 14, 2011 Members Share Posted May 14, 2011 sounds rad. why does the rear pic of the lh50 on laney's site only show two EL34s tho? Link to comment Share on other sites More sharing options...
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