Hello. im a newcomer to this site and i'm hoping to get some advice 
As a first audio orientated project i'm working on a hybrid Headphone amp. It is mostly pretty simple. A 6N16B-V tube in Class-A mode operating at a voltage of aprox 85v is to amplify the input signal of which the output is then decoupled to a solid-state stage consisting of a OPA2134 and TPA6120a2 in a composite setup.
My problem is that early tests and simulations show that during startup the decoupling capacitor between the tube and solid-state stage will get a bit of a inrush resulting in a sizable offset (~2v for 3 seconds) to the solid-stage and thus also to the final output. I need advice on how to best deal with this as the last thing i want is to send 2v dc into headphones when turning the device on.
Right now i'm thinking of either using a additional buffer between the tube and composite with it's own output decoupling capacitor (having that deal with initial offset rather then output-stage). Another one would be Output capacitor at the end to protect the headphone (tough that would cost a bit of space), but yeah input from experienced people would be very much appreciated.
Speaking about Output capacitors. If i were to use that as a solution and my solid-state stage is dual-rail powered with a nominal DC-offset of nearly 0v (give or take a few mV). would i need to use a bi-polar? or would a well-rated polar cap work fine aswell?
As a first audio orientated project i'm working on a hybrid Headphone amp. It is mostly pretty simple. A 6N16B-V tube in Class-A mode operating at a voltage of aprox 85v is to amplify the input signal of which the output is then decoupled to a solid-state stage consisting of a OPA2134 and TPA6120a2 in a composite setup.
My problem is that early tests and simulations show that during startup the decoupling capacitor between the tube and solid-state stage will get a bit of a inrush resulting in a sizable offset (~2v for 3 seconds) to the solid-stage and thus also to the final output. I need advice on how to best deal with this as the last thing i want is to send 2v dc into headphones when turning the device on.
Right now i'm thinking of either using a additional buffer between the tube and composite with it's own output decoupling capacitor (having that deal with initial offset rather then output-stage). Another one would be Output capacitor at the end to protect the headphone (tough that would cost a bit of space), but yeah input from experienced people would be very much appreciated.
Speaking about Output capacitors. If i were to use that as a solution and my solid-state stage is dual-rail powered with a nominal DC-offset of nearly 0v (give or take a few mV). would i need to use a bi-polar? or would a well-rated polar cap work fine aswell?