- Item: 2a3/45 Amplifier and All valve phono preamp stage
- Type: Single Ended Amplifiers
- Posted: 9 March 2014
- Builder: jervill
- Country: United Kingdom
- Comments: 0
Recreational Electronics Development aka RED Amps
Both amplifiers are based on Joseph Esmilla's circuits and were completed nearly 2 years ago. The power amplifier is based on the 2a3dx circuit but in the photos are sporting Tung-Sol 45s. This was after some slight modifications to be able to try a pair of then NOS 45s for a few months.
The preamp is based on the Full Function pre. One chassis holds the power supply and the other, the main amp. The umbilical connection is a seven pin IEC plug and socket.
The valve complement are vintage, 6sl7, 6sn7, 45, 76, 5u4gb and 5y3gt.
The colour scheme was influenced by Raymond Koonce's projects in Time Bandit Audio. The configuration of the preamp was inspired by Icon Audio's phono stages.
My main aesthetic consideration for the power amp was to have it look the least cluttered on top. So I planned it to have the minimum amount of bolt heads protruding from the surface of the chassis. The four bolts visible at the front holds a tagboard that pretty much holds the majority of the circuit's components inside.
The preamp's considerations were based on space and trying to achieve some symmetry. The chassis is narrow which meant using the smallest 47uf 450v caps I could find and mounting them on top. These are JJ radials with clip on prongs. The harder part was finding capacitor clamps that would hold caps that small.
The preamp is based on the Full Function pre. One chassis holds the power supply and the other, the main amp. The umbilical connection is a seven pin IEC plug and socket.
The valve complement are vintage, 6sl7, 6sn7, 45, 76, 5u4gb and 5y3gt.
The colour scheme was influenced by Raymond Koonce's projects in Time Bandit Audio. The configuration of the preamp was inspired by Icon Audio's phono stages.
My main aesthetic consideration for the power amp was to have it look the least cluttered on top. So I planned it to have the minimum amount of bolt heads protruding from the surface of the chassis. The four bolts visible at the front holds a tagboard that pretty much holds the majority of the circuit's components inside.
The preamp's considerations were based on space and trying to achieve some symmetry. The chassis is narrow which meant using the smallest 47uf 450v caps I could find and mounting them on top. These are JJ radials with clip on prongs. The harder part was finding capacitor clamps that would hold caps that small.
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