I often get questions on whether the cost of upgrading to higher quality output coupling caps is worth the money. Our stock caps are decent commercial grade high quality metalized polypropylene caps which do a fine job. But we offer options to upgrade these to VCAP ODAMs (oil damped advanced metalized polyprop) for $440 more and then there's the VCAP CuTF copper teflon caps for a whopping $1024 adder.
I just spent some time listening to one our production LDR3000T Tube Preamps with the CuTF upgrade. Physically these are heavy because there's so much copper foil in them that they feel like a roll of quarters in your hand. For this reason we chose to tie each one down with its own substantial tie-wrap.
One way to describe the benefit of these big heavy caps is they're like driving a Lexus.There's no mistaking the bigger, better, smoother, tighter and more solid ride of Lexus car. Is it worth the $ 20-30k premium? That always comes down to a personal judgment but there's no mistaking that you're in a better car. That's what listening to this preamp is like with the VCAP copper teflon output caps. Everything just sounds better, more real, more present, more involving. The mids and highs are especially more alive and natural.
Whether you're looking for that last bit of performance or simply believe that big, heavy and expensive is better, these VCAP CuTF do not disappoint. Wow!