consonancemad Posted October 15, 2008 Posted October 15, 2008 hi all i was the lucky winner of a mcintosh 275 comemorative edition poweramp on ebay and am looking to try my hand at some tube rolling it uses 3x 12ax7,4x 12at7 and 4 x kt88 im hoping someone can reccomend me some good tubes also if i do change some tubes do i then have to adjust the bias cheers
Jake Posted October 15, 2008 Posted October 15, 2008 Hey, I was watching that! Nice one CM, well done mate. Cheers, Jake
consonancemad Posted October 15, 2008 Author Posted October 15, 2008 hi jake i got a bit exited at the end and paid more than i planned but im rapped now, it sounds very nice running a manger full range
Jake Posted October 15, 2008 Posted October 15, 2008 Great price though all the same. Much cheaper than new. Congrats.
RoHo Posted October 16, 2008 Posted October 16, 2008 The new Genelex Gold Lion KT88 re-issue have got a lot of good press lately. I've used Electro-Harmonix KT88 with no dramas, but I prefer EL34/6CA7 in my amp. You should regularly check the output tubes bias anyway and certainly when you change the output tubes.
metal beat Posted October 16, 2008 Posted October 16, 2008 Personally I use Mullard 12ax7 and 12at7's. the 12 at7's are the most reasonable NOS price, the 12ax7's are very pricy. I like the Svetlana 6550's instead of KT88's You should just listen and enjoy the amp first before you go changing tubes thou
56oval Posted October 16, 2008 Posted October 16, 2008 (edited) Hello CM My dropped over and he thinks he might have some Telefunken 12ax7 & 12at7's . With the KT88's the only NOS to look at GEC KT88's . Check the voltages before using 6550's ,look for NOS 1970 Sylvania 6550's . If there like there other tubes KR Audio's KT88's could be a real suprise but $$$$$$. Some reading http://www.jacmusic.com/KT88/kt88.htm Cheers Edited October 16, 2008 by 56oval
FAPOS Posted October 16, 2008 Posted October 16, 2008 Highly recommend the Genalex Gold Lion KT88 reissue by New Sensor - made my Cayin A100T sound like a whole different, and better amp! NOS KT88s are extremely expensive. As for the others im not sure as mine uses 12AU7 pre valves - ive got NOS Mullard, Amperex & Telefunkens - all which are miles ahead of the 'new' manufactured chinese valves that came with my amp, so id go for NOS with your 12ax & at7s. Luckily they're still fairly affordable too. Check the info out here, might help you decide: https://www.tubeworld.com/12ax7.htm https://www.tubeworld.com/12at7.htm
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