Ray_pierrewit Posted May 21, 2019 Share Posted May 21, 2019 Can somebody please confirm that the Scott 299B can use 7189A tubes? I've found a matched quad of NOS Sylvania 7189A locally for about the same price as the Russian EL84M that I'm currently using. Any opinions on the Sylvania 7189A? The gentleman also has cheap 6BL8 tubes for sale ($15 each), I think they are Marconi. Worth it? I would like to have a backup set of tubes for the future. Many thanks, Daniel Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted May 21, 2019 Share Posted May 21, 2019 @NOS Valves @tube fanatic 1 Quote Link to comment Share on other sites More sharing options...
NOSValves Posted May 22, 2019 Share Posted May 22, 2019 Buy those vintage 7189A tubes if you can confirm they are truly NOS the N stands for New. I say this because the definition of NOS has been abused to include used tubes for years. Yeah the 299B is a 7189 amp it can use the 7189A just fine. Quote Link to comment Share on other sites More sharing options...
Ray_pierrewit Posted May 22, 2019 Author Share Posted May 22, 2019 4 hours ago, NOSValves said: Buy those vintage 7189A tubes if you can confirm they are truly NOS the N stands for New. I say this because the definition of NOS has been abused to include used tubes for years. Yeah the 299B is a 7189 amp it can use the 7189A just fine. Ha! Yeah, it's surely an abused term. The seller told me that he'd test them in front of me to confirm that they all test NOS. Thanks for the reply Craig! Quote Link to comment Share on other sites More sharing options...
NOSValves Posted June 2, 2019 Share Posted June 2, 2019 Funny thing is NO TEST EXIST that the answer comes back to confirm NOS or a truly measured and accurate life test. A tube tests the same for 90% of its life and than drops like falling off a cliff. 1 Quote Link to comment Share on other sites More sharing options...
Endo Posted June 2, 2019 Share Posted June 2, 2019 ^ Did not know this. This is very helpful. Thank you. Quote Link to comment Share on other sites More sharing options...
Ray_pierrewit Posted August 28, 2019 Author Share Posted August 28, 2019 So I ended up purchasing the quad of Sylvania 7189A for a good price. I had not noticed that the tubes are in fact two sets of matched pairs, both sets made in England. They are both labeled 7189A on the tubes, is there any reason this would not work in the 299B? Is there a preferred way of arranging the tubes? Quote Link to comment Share on other sites More sharing options...
NOSValves Posted August 29, 2019 Share Posted August 29, 2019 It will work just fine. Those are re-branded most likely Mullard made tubes. Sylvania never made tubes in England. Either way they should be really good tubes. Do realize the 299B is not a plug and play amplifier when it comes to the output tubes they do require proper biasing when installed and periodically after that. 1 Quote Link to comment Share on other sites More sharing options...
Ray_pierrewit Posted August 29, 2019 Author Share Posted August 29, 2019 Thanks for responding Craig. Yeah, I actually enjoy biasing the amp and checking it every once in a while to ensure that it's acting properly. So would you recommend that I mix the matched pairs or mate them together? 1 Quote Link to comment Share on other sites More sharing options...
NOSValves Posted September 3, 2019 Share Posted September 3, 2019 mix and match pairs? Not sure what you mean? Quote Link to comment Share on other sites More sharing options...
seti Posted September 4, 2019 Share Posted September 4, 2019 I found this helpful. I've always wondered why the Mullards are so smokey.. Quote Link to comment Share on other sites More sharing options...
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