Hi.
I started building a 10Y line preamp with ll1660s as output transformers.
I first thought of my 100K (shunt) stepped attenuator at input but Thomas Meyer strongly suggests to use an AVC at output. The only "good" one I know comes from Intact Audio (D.Slagle).
However, it seems many TVC are around (Sowther, Silk, Glasshouse, stuff from eBay...).
Does someone have experiments, thoughts, inputs to share?
Thanks
Pierre
I started building a 10Y line preamp with ll1660s as output transformers.
I first thought of my 100K (shunt) stepped attenuator at input but Thomas Meyer strongly suggests to use an AVC at output. The only "good" one I know comes from Intact Audio (D.Slagle).
However, it seems many TVC are around (Sowther, Silk, Glasshouse, stuff from eBay...).
Does someone have experiments, thoughts, inputs to share?
Thanks
Pierre
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Hi
Either will work very well. I built a 10Y pre with an AVC a while ago.
TVCs have a theoretical advantage in that there is a measure of galvanic isolation
inherent in the principle also it is easy have a balanced i/p. With an AVC you need
separate i/p txs to provide this feature if you need it.
Personally I think this is a better approach but I would say that as I have designed AVCs for a commercial product which uses separate txs.
I would use whatever you can get at the best price. The AVC should be cheaper as its easier to make.
Either will work very well. I built a 10Y pre with an AVC a while ago.
TVCs have a theoretical advantage in that there is a measure of galvanic isolation
inherent in the principle also it is easy have a balanced i/p. With an AVC you need
separate i/p txs to provide this feature if you need it.
Personally I think this is a better approach but I would say that as I have designed AVCs for a commercial product which uses separate txs.
I would use whatever you can get at the best price. The AVC should be cheaper as its easier to make.
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Hi Pierre,
Tribute audio also makes AVCs, but thera are indeed many more TVCs around.
Using a TVC instead of AVC after the LL1660 allows for balanced output, which may come in handy. If I had this preamp, and either AVC or TVC, I would try it at both the input and output, as each has advantages and disadvantages (as always).
Well, I didn't say a lot, he 🙂 but at least now I am subscribed, as I am curious what other members have to say.
Good luck with the project! Erik
Tribute audio also makes AVCs, but thera are indeed many more TVCs around.
Using a TVC instead of AVC after the LL1660 allows for balanced output, which may come in handy. If I had this preamp, and either AVC or TVC, I would try it at both the input and output, as each has advantages and disadvantages (as always).
Well, I didn't say a lot, he 🙂 but at least now I am subscribed, as I am curious what other members have to say.
Good luck with the project! Erik
didn't think of that, but Zeta4 has a good point: with a TVC at the input you can have both balanced and single ended inputs and outputs. Looks like a nice bonus, especially when considering the large amount of DACs with balanced output nowadays.
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