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NOS tubes...
in Classifieds
It appears I have 7x Siemens D3A/7721 vacuum tubes. I have no use for them. They were popular in vinyl preamps because of their high gain. These are the orange-boxed straight-tubes without pinches, and appear to be new. As I said- I have 7 of them. They are going for some serious money on the bay.
Make me an offer, shipping to lower 48 only, or I can bring them to InDIYana 2021 in LaPorte...
Wolf
Comments
Here's a simple single stage headphone amp circuit using those, for anyone interested - it's #27 in the pictures.
kyledellaquila.com/root_55.htmlhttp://
If I didn't already have too many projects on the list.....
Really? Might have a looksee...
InDIYana Event Website
I don't see the big Solens in the Schematic, so that might be hard to follow...
InDIYana Event Website
I think he's using those as a local LC power supply stage on the audio chassis. You can see some small chokes behind the tubes.