Soundthought Posted October 13, 2003 Share Posted October 13, 2003 Hello, I'm restoring an old Lafayette LR800 stereo receiver. It runs a 7189 output. The quad set in there is totally fried and barely even registering. As i've been searching for a replacement set, I came across a strange cross-reference. EL84 = 6BQ5 = 7189 But only in that order. Why is that? When I reference anything concerning the 7189 pentode, it doesn't say anything about 6BQ5s. When I physically compare the 7189 with the EL84, it does show some internal differences. Though, the book says they have the same heater voltage and current That is really what counts here, isn't it? I just wanted to be absolutely sure they are compatible before I proceed. EL84s don't grow on trees, anymore. Somewhere, I read that the old Black Magic(?) ham radio amps used the 7189 and were frequently swapped with EL84s. What do you fella think? Regards, John. Quote Link to comment Share on other sites More sharing options...
arfz28 Posted October 13, 2003 Share Posted October 13, 2003 I have seen some output tubes on ebay that are marked 7189A, is that the same as the el84 and 6bq5 too, or is this some kind of differently made output tube? Also their is the 6u8 and 6u8a tubes, are they the same. I think I read some where but I aint for sure, that the (A) behind the tube number is meaningless and that they are the same tubes. Quote Link to comment Share on other sites More sharing options...
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