I'm not a tube expert, but I think a Bendix 6900 is a 5687 substitute. Hopefully, the tube experts here will chime in.
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Bendix Red Bank 6900 is probably the holy grail of the 5687 tube type. However a LOT of people know this. IF you can find a NOS pair expect to pay upwards of $600 for a pair. Due to rarity and cost I've never owned 6900's so I can't comment on the sound. The old black plate Tung Sols are getting expensive too these days. For the money, I really like the GE "five star" 5687's. They are a fine sounding tube and are still below the radar, so prices are sane. As far as "glare" goes that could be caused by anying in the chain. Its not always the tube.
OK, thanks. I didn't think my current 5687s (tungsol/raytheons, not sure if they are "black-plates") are causing glare, I just
thought there might be a version with a mellow character.
And since those Bendix ones are so rare and expensive and I need 2 matched pairs, I don't think that is practical. But thanks for the suggestions.