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Item: Philips Minwatt GZ34 matched pair Location: Adelaide Price: $425 Item Condition: pristine Reason for selling: surplus Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: Very rare matched pair. Made in England Pictures:

Item: NOS 596 (Fits 5R4/5U4G) Tube United Rectifier with Adaptor Location: South Sydney Price: $75 plus postage (I bought for $175 with adaptor) Item Condition: NOS minus couple of hours. Reason for selling: Using solid state Class A amp Payment Method: Pickup - Cash, Paypal, COD Only Extra info: Bought new from USA in a sealed box some months back. I paid $175 for the tube including postage and adaptor

Item: NOS 596 Tube United Rectifier with Adaptor Location: South Sydney Price: $85 plus postage (I bought for $175 with adaptor) Item Condition: NOS minus couple of hours. Reason for selling: Using solid state Class A amp Payment Method: Pickup - Cash, Paypal, COD Only Extra info: Bought new from USA in a sealed box some months back. I paid $175 for the tube including postage and adaptor. Sounds as good an anything I’ve heard under $300. This tube is NOS minus couple of hours and would most definitely test as new. I guarantee it.

I read previously that changing the rectifier valve on the Supratek power supply unit can make significant changes in sound quality. In particular, a NOS Bendix 6106 will tighten up the bass. In my case, the standard rectifier and another I tried ( NOS Mullard EZ34) provided deep bass, but it was not as tight as I would like. Well the difference with the Bendix 6106 is profound, in that the bass is as tight as one could hope for ( as tight as a decent solid state setup - and I am using all valves). I have the Supratek Cabernet Dual, and even dialling up the separate bass feed ( I use 6H30's for bass and 101d's for mid-high frequencies through 4 monoblock power amps), the bass became more pronounced but still very tight. So before fiddling with power amps and speakers to optimise bass response, the culprit could well be the choice of rectifier valve in the Supratek preamp.