RCA 5691 red base pair sold by Raytheon Uniline premium line.

Test 1340/1320 & 1350/1440 where 1000 is good at 250 volts in a Triplett 3444/Westmore 501 laboratory tube analyzer restored and upgraded by Paul Hart.

Listening tested for excessive noise & microphonics in a Maxi-preamp 2 tester.

All tubes are guaranteed to test good or may be returned.  

Shipping includes insurance.

Please see our other items for more vintage tubes & audio.

We combine orders for shipping.

We do not change values for customs.  

Thank You.