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I have a matched quad of EL51 with adapters for sale.  I had purchased them to use in Response Audio Extreme 3205 integrated amplifier but after receiving them and plugging them in the amp I realized that the bias probe location is too close to the tubes and only way that I might be able to bias is if I take a chance of burning my hand 
Looking for 450 + shipping + paypal if not using friends and family

Information from the seller who I purchased the quad from:

"attached are photos of the EL51 quad. All the tubes test well (anode current, transconductance, leaks/shorts, grid emission all OK), and are in nice condition, practically no putty rattling inside the bases. Two were new in box, but I had to throw away the boxes, those were beyond saving. One base has been re-glued, and one has been completely re-soldered and re-glued (see photo 03). All are now ready to use. All 1961/1962 date codes with same OO getter construction. Nice tubes."