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In the Forum: Melquiades Amplifier
In the Thread: GM70 vs. 6C33C
Post Subject: GM70SE VS 6C33CSEPosted by KOTriode on: 4/26/2012
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I just finished the GM70SE amplifier. It is built on the same size chassis as the 6C33C (with few extra holes) but 1/2 in higher to accommodate quite a few extra parts.
The GM70SE is built with quite interesting feature similar to 6C33CSE :
- Double Tube rectifier & voltage regulator: A first of its kind, it has 1100V regulator for the GM70 and 550V regulator for the input and driver stage. The 6C33C has the same regulator but at much lower voltage.
- No coupling cap in the signal chain, 3 stages design with interstage for driver. 6C33CSE has 2 stages with interstage transformer.- Oil & film cap used for B+ (no electrolytic)
- At 35W it has almost twice the output of 6C33CSE, it should since the GM70 tube is run at max Pd of 120W.
I would not comment on the sound right now, since I will have to play with at least 3-4 driver tubes to find the best match for the GM70, and that might take many moons.
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