creeve Posted June 22, 2016 Share Posted June 22, 2016 Hello all, I just picked up a Yaqin MC-5881a. It is used with an unknown number of hours on it, but in perfect condition as far as I can tell. It uses 4 Shuguang 5881a power tubes and 4 Shuguang 6n1 preamp tubes. I have already rolled in some JJ 6l6gc's but am having trouble finding suitable upgrades for the 6n1. From everything that I have read there is no true electrically equivilant substitute for these but the 6n1p-ev is the closest match. The problem is that I have also heard and it even states on a well known tube supplier website that these are known to induce hum in Yaqin amps. So my question to you all is has anyone successfully used a different preamp tube in this amp and if so what did you use. Thanks Chris Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted June 22, 2016 Share Posted June 22, 2016 (edited) I use a Yaquin VK 2100 amp. It has the 6n-1p tubes in the preamp. No hum for around 3 years and the tubes are still going strong. I have not found much benefit in tub rolling. It sounds great and replace my McIntosh, MAC 1700. Edited June 22, 2016 by derrickdj1 Quote Link to comment Share on other sites More sharing options...
Jim Posted June 22, 2016 Share Posted June 22, 2016 Chris, I use the NOVS (Novosibirsk) 6H1N on mine and they sound wonderful. I have the MC-10L. All mine are NOS tubes. I have 1 quad Gold Pin from 1990, and 5 quads from 1966. No hum and super quiet. If you're interested, I'd let a quad go on either the Gold Pin, or the others. Let me know. Jim Quote Link to comment Share on other sites More sharing options...
mike stehr Posted June 22, 2016 Share Posted June 22, 2016 https://en.wikipedia.org/wiki/6N1P Quote Link to comment Share on other sites More sharing options...
creeve Posted June 23, 2016 Author Share Posted June 23, 2016 Chris, I use the NOVS (Novosibirsk) 6H1N on mine and they sound wonderful. I have the MC-10L. All mine are NOS tubes. I have 1 quad Gold Pin from 1990, and 5 quads from 1966. No hum and super quiet. If you're interested, I'd let a quad go on either the Gold Pin, or the others. Let me know. Jim PM Replied Quote Link to comment Share on other sites More sharing options...
creeve Posted June 23, 2016 Author Share Posted June 23, 2016 I managed to dig up schematic don't know how reliable it is as I did not trace the circuit myself but I can post if needed Quote Link to comment Share on other sites More sharing options...
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