Re: Kolster-Brandes MR10
It shouldn't matter if you use an ECC81 or a 12AT7 and it shouldn't make any difference which make you buy. But do buy from a reliable source you can trust. Often ones sold on the popular auction site can be anything from dead to working, unless they say tested as good then you dont have much come back.
You might even be able to use an ECC83 in some sets but they don't work quite as well in this application.
Mike
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