I just came across a box of various CK and CV type tubes (i.e. CK503AX and CV2243).

I can't seem to find a substitution list for these type of tubes.

What are these type of tubes? Why the CV and CK numbering system?

Can anyone help?

Hi Doug

CK are Raytheon tube numbers. The CK503AX is a sub-min tube used in early hearing aids. You can find some information here at nostalgiaair under tubes.

There is a cross reference for CV numbers at duncanamps.com.

Norm

: I just came across a box of various CK and CV type tubes (i.e. CK503AX and CV2243).

: I can't seem to find a substitution list for these type of tubes.

: What are these type of tubes? Why the CV and CK numbering system?

: Can anyone help?

I'd like to sell them. Would you know what their approx. value would be??
: Hi Doug

: CK are Raytheon tube numbers. The CK503AX is a sub-min tube used in early hearing aids. You can find some information here at nostalgiaair under tubes.

: There is a cross reference for CV numbers at duncanamps.com.

: Norm

: : I just came across a box of various CK and CV type tubes (i.e. CK503AX and CV2243).

: : I can't seem to find a substitution list for these type of tubes.

: : What are these type of tubes? Why the CV and CK numbering system?

: : Can anyone help?

I'd like to sell them. Would you know what their approx. value would be??
: Hi Doug

: CK are Raytheon tube numbers. The CK503AX is a sub-min tube used in early hearing aids. You can find some information here at nostalgiaair under tubes.

: There is a cross reference for CV numbers at duncanamps.com.

: Norm

: : I just came across a box of various CK and CV type tubes (i.e. CK503AX and CV2243).

: : I can't seem to find a substitution list for these type of tubes.

: : What are these type of tubes? Why the CV and CK numbering system?

: : Can anyone help?

Doug

List them on ebay if you like but don't expect a lot of money. Maybe $1.00 each with certain types bringing more. Give it a try.

Norm

: I'd like to sell them. Would you know what their approx. value would be??
: : Hi Doug

: : CK are Raytheon tube numbers. The CK503AX is a sub-min tube used in early hearing aids. You can find some information here at nostalgiaair under tubes.

: : There is a cross reference for CV numbers at duncanamps.com.

: : Norm

: : : I just came across a box of various CK and CV type tubes (i.e. CK503AX and CV2243).

: : : I can't seem to find a substitution list for these type of tubes.

: : : What are these type of tubes? Why the CV and CK numbering system?

: : : Can anyone help?

I just found a brand new Raytheon CK503AX in my stock. If interested write me about it.