MU 6900s, Wondering if I Shoud Use These

Posted by garyralph (A) on August 1, 2006 at 17:11:13

In my excitement to get my hands on a set of Bendix 6900 tubes for my NAF 845 SE Integrated amp, I'm afraid that I made a less than wise purchase. First of all, I found these on ebay, and please don't ask how much. Let's just say I feel foolish about that, but I'll be okay with the price if these work out. I think the seller is known to members of this forum.

The tubes look pristine, completely unused, but I have no way to test them. They sound a bit thin in my amp, more so than the 5687s or 7119s I have used. I know that this tube may be brighter in character, but I'm not sure that's what I'm hearing. The distributor recommended the 6900 tube as an excellent alternative, so I don't have compatability concerns.

The thing that concerns me is that in digging through old posts, I find that these may have been Bendix rejects in the first place. The tubes do appear to have a defect in that the silver layer on top of the tube is very sparse. On one tube it covers only a small area around the exhaust tip. On the other, it covers only one half of the top of the tube. Based on this, or anyone's experience with the MU branded 6900s, is there reason for concern? Otherwise, I'd be willing to run them for a bit, to see if they open up. Either way, from now on I'll follow the prevailing wisdom in buying my tubes from reputable dealers. Thanks for any input.

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Topic - MU 6900s, Wondering if I Shoud Use These - garyralph 17:11:13 08/01/06 (13)

Re: MU 6900s, Wondering if I Shoud Use These - garyralph 16:04:29 08/02/06 (4)

Re: MU 6900s, Wondering if I Shoud Use These - FYI on getter materials - good stuff - Rob Mercure 07:33:33 08/03/06 (2)

Re: MU 6900s, Wondering if I Shoud Use These - FYI on getter materials - good stuff - garyralph 18:55:54 08/03/06 (1)

Tubes are Spoken for - garyralph 12:43:03 08/05/06 (0)

Re: MU 6900s, Wondering if I Shoud Use These - Len_ 00:34:35 08/03/06 (0)

Re: MU 6900s, Wondering if I Shoud Use These - Rob Mercure 09:51:10 08/02/06 (0)

Re: MU 6900s, Wondering if I Should Use These - Jimmy 07:05:56 08/02/06 (0)

Re: MU 6900s, Wondering if I Shoud Use These - Rick C 19:54:11 08/01/06 (4)

Re: MU 6900s, Wondering if I Shoud Use These - thetubeguy1954 10:45:18 08/02/06 (3)

Re: MU 6900s, Wondering if I Shoud Use These - Rick C 16:32:45 08/02/06 (2)

Re: MU 6900s, Wondering if I Shoud Use These - thetubeguy1954 08:44:40 08/03/06 (1)

Re: MU 6900s, Wondering if I Shoud Use These - Rick C 21:41:35 08/03/06 (0)

Re: MU 6900s, Wondering if I Shoud Use These - sacd lover 17:59:11 08/01/06 (0)

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