Niravp... glad you are enjoying your new Calypso with your Dyns. If you have not already done so, I highly recommend you get some good 12AX7 NOS tubes. Mullard CV 4004's are a good choice and can be had for approx. $250 per pair. Same goes for NOS Telefunkens. The 6922 tubes are not as critical and should be second priority after the 12AX7's. Try looking at listing from Audiogoner "SAM1104" ... or look up Brendan @ tubeworld.com.