Before listening to my BHSE with the EL34PH's, I listened to one of the 3 albums with the SED's, that album was Tubular Bells which I have on SACD.
I obviously had to let the BHSE cool down before I could take the SED's out and replace them with the EL34PH's, however as soon as I inserted the PH's, Tubular Bells was the first album I listened to again, and I listened to the BHSE without leaving it to warm up, and even though I used the BHSE straight away, I could still hear an improvement.
I'm normally pessimistic with certain things, and if I hear something that doesn't sound any different, then I don't hesitate in saying so, but with what I heard using the EL34PH's, that wasn't the case.
Some might not hear a difference, but I did.
I won't be putting the SED's back in my BHSE unless something happens the PH's, in fact I'll probably be putting the SED's on eBay.