MULLARD GZ32 BLACK BASE BLACK SPOT WELDED PLATES, INVERTED FOIL CUP GETTER. VERY RARE EARLY VERSION, THREE TUBES. TESTED ON A AMPLITREX AT1000 IN FIXED BIAS MODE. THE AT1000 TEST THE GZ32 FOR ELECTRICAL OUTPUT NOT LIFE. TUBE 1 test A fwd 13V peak, Rev 404VB fwd 13V peak, Rev 401VTUBE 2 test A fwd 13V peak, Rev 403VB fwd 13V peak, Rev 398VTUBE 3 test A fwd 14V peak, Rev 404VB fwd 12V peak, Rev 398VSTRONG TUBES VERY RARE. I CANNOT GUARANTEE HOW THESE WILL SOUND IN YOUR APPLICATION.NO RET...URNS, NO REFUNDS. SOLD AS IS, AS DESCRIBED, AS PICTURED.PLEASE SEE ALL THE PICTURES THEY ARE THE DESCRIPTION.THE ITEMS IN MY PICTURES ARE ALWAYS THE ITEMS YOU WILL RECEIVE, AS PICTURED.PLEASE ASK ANY QUESTIONS BEFORE BUYING.SOLD AS IS. NO RETURNS. NO REFUNDS.INTERNATIONAL BUYERS PLEASE ASKFOR SHIPPING COST TO YOUR LOCATION BEFORE BUYING OR MAKING AN OFFER. TO MANY INTERNATIONAL COUNTRIES THE ONLY SHIPPING OPTION IS EXPRESS POST WHICH IS VERY EXPENSIVE! Buyer is responsible for all shipping, duties and associated costs. Always willing to combine shipping. I do not make money off shipping. Flat rate shipping fee is an estimate only. If it costs less to ship to your location, you will be refunded the difference. If it costs more to ship to you, you will be charged the difference. I ship with tracking and signature required only. Please ask any questions before buying. Thank you for checking out my rare audio listing and please see my other listings for more rare audio gear.