disarmamant
10-02-2018, 15:13
Pair of EL34 push pull monoblock amplifers based on the Universal Driver PCB's from Pete Millett.
I built these about five years ago to drive a pair of Quad ESL57 which they did really well. Since then they have been in constant daily use with Living Voice OBX, Harbeth P3ESR and Harbeth M30.1 and been 100% reliable with marvellous sound quality.
Constructed on a pair of Hammond soild walnut chassis with aluminium top and bottom plates.
Switchable, Ultra Linear or Triode mode. 25 watts per channel class A in Ultra Linear. 15 watts per channel class A in Triode mode.
Valve rectified choke input power supply.
http://www.pmillett.com/push-pull_kt88_class_a_amp_with_universal_driver_pcb.ht m.
https://dl.dropbox.com/s/a28nnxzmbdgv1n8/Amps%20Pair.jpg?dl=0
The driver PCB uses a Sowter transformer at the input for splitting the phase followed by two triode differential stages using the 6SN7GT dual triode valves driving the EL34 push pull output stage. Can be used with unbalanced RCA or balanced XLR input from a pre amplifier.
All Hammond iron, mains transformer, chokes and output transformer. The output transformer is a beefy 60 watt Hammond 1650PA which is over specified for EL34’s, but it means that KT88’s and 6550 could also be used.
Output transformer taps and binding posts for 4, 8 and 16 Ohms.
https://dl.dropbox.com/s/34d2jsrtu7c289m/Input%20outuput.jpg?dl=0
https://dl.dropbox.com/s/42r0wlicdtl6ff0/1650pa.jpg?dl=0
Comes with two NOS Mullard CV378 (GZ37) rectifier valves, four NOS Raytheon 6SN7GTB input / driver valves and two new unused pairs of Tung Sol EL34B power pentode output valves.
https://dl.dropbox.com/s/7h75tq9co057ch1/GZ37%20x%202.jpg?dl=0
https://dl.dropbox.com/s/gmnv8w0offxv0bq/Raytheon%206SN7GTB%20x%204.jpg?dl=0
https://dl.dropbox.com/s/ksrohx78grxfuym/Raytheon%206SN7GTB%20x%204%232.jpg?dl=0
https://dl.dropbox.com/s/f6hq0dqwa7tbezb/Tung%20Sol%20EL34B%20x4.jpg?dl=0
Quality components used througout, Black Gate cathode bypass capacitors. Russian paper in oil coupling capacitors.
https://dl.dropbox.com/s/hu5272e5z3qfdgv/under%20hood.jpg?dl=0
https://dl.dropbox.com/s/05j1xpjyzo1fx59/no%20valves%20%232.jpg?dl=0
https://dl.dropbox.com/s/0eji9qw7imof7v0/single%20rear.jpg?dl=0
https://dl.dropbox.com/s/tovl6d4x2i2wnvu/underside.jpg?dl=0
https://dl.dropbox.com/s/adz4yski0vf0y4h/Mode%20and%20stndby.jpg?dl=0
£975 Buyer to inspect, audition and collect. Payment by cash or bank transfer.
I'd rather not trust these to a courier, but shipping at buyers cost and risk. These are heavy, 15Kg each without valves, so they would ideally need to be crated for shipping.
I built these about five years ago to drive a pair of Quad ESL57 which they did really well. Since then they have been in constant daily use with Living Voice OBX, Harbeth P3ESR and Harbeth M30.1 and been 100% reliable with marvellous sound quality.
Constructed on a pair of Hammond soild walnut chassis with aluminium top and bottom plates.
Switchable, Ultra Linear or Triode mode. 25 watts per channel class A in Ultra Linear. 15 watts per channel class A in Triode mode.
Valve rectified choke input power supply.
http://www.pmillett.com/push-pull_kt88_class_a_amp_with_universal_driver_pcb.ht m.
https://dl.dropbox.com/s/a28nnxzmbdgv1n8/Amps%20Pair.jpg?dl=0
The driver PCB uses a Sowter transformer at the input for splitting the phase followed by two triode differential stages using the 6SN7GT dual triode valves driving the EL34 push pull output stage. Can be used with unbalanced RCA or balanced XLR input from a pre amplifier.
All Hammond iron, mains transformer, chokes and output transformer. The output transformer is a beefy 60 watt Hammond 1650PA which is over specified for EL34’s, but it means that KT88’s and 6550 could also be used.
Output transformer taps and binding posts for 4, 8 and 16 Ohms.
https://dl.dropbox.com/s/34d2jsrtu7c289m/Input%20outuput.jpg?dl=0
https://dl.dropbox.com/s/42r0wlicdtl6ff0/1650pa.jpg?dl=0
Comes with two NOS Mullard CV378 (GZ37) rectifier valves, four NOS Raytheon 6SN7GTB input / driver valves and two new unused pairs of Tung Sol EL34B power pentode output valves.
https://dl.dropbox.com/s/7h75tq9co057ch1/GZ37%20x%202.jpg?dl=0
https://dl.dropbox.com/s/gmnv8w0offxv0bq/Raytheon%206SN7GTB%20x%204.jpg?dl=0
https://dl.dropbox.com/s/ksrohx78grxfuym/Raytheon%206SN7GTB%20x%204%232.jpg?dl=0
https://dl.dropbox.com/s/f6hq0dqwa7tbezb/Tung%20Sol%20EL34B%20x4.jpg?dl=0
Quality components used througout, Black Gate cathode bypass capacitors. Russian paper in oil coupling capacitors.
https://dl.dropbox.com/s/hu5272e5z3qfdgv/under%20hood.jpg?dl=0
https://dl.dropbox.com/s/05j1xpjyzo1fx59/no%20valves%20%232.jpg?dl=0
https://dl.dropbox.com/s/0eji9qw7imof7v0/single%20rear.jpg?dl=0
https://dl.dropbox.com/s/tovl6d4x2i2wnvu/underside.jpg?dl=0
https://dl.dropbox.com/s/adz4yski0vf0y4h/Mode%20and%20stndby.jpg?dl=0
£975 Buyer to inspect, audition and collect. Payment by cash or bank transfer.
I'd rather not trust these to a courier, but shipping at buyers cost and risk. These are heavy, 15Kg each without valves, so they would ideally need to be crated for shipping.