re-tubing CJ LP70s

Keshui
You could try the GE 5751 tripple mica or RCA 5751 tripple mica either black plate or gray. I have the black plate but not sure if the gray plate sounds a lot different. A matched pair of these are typically less than the 12AX7 tubes. These are not too hard to find in a matched pair. You might check to see what the gain blocks are set on the Calypso and lower the gain if the tubes are noisy.

The cheapest route would be to change out the Telefunken 12AX7 tubes in the Calypso to something not has solid state sounding as the telfunkens. You could try Mullards, Amperex or one of the NOS 5751 tubes. That's what I did. If this doen't work then you could change out the tubes on the amp. There are many threads on Audiogon or AudioAsylum about changing the Calypso Tubes.