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Positive Feedback homepage - click issue for more information Positive Feedback vol.5, no.3 Positive Feedback vol.5, no.4 Positive Feedback vol.5, no.5 code:PFV05N03   price exc. p+p UK/EUROPE/WORLD - £7.00 KEY TOPICS The GAIN System The Black Hole amp Tube Fest Sonic Frontiers DAC-1 A-20 Class A amp Notes on SE designs code:PFV05N04   price exc. p+p UK/EUROPE/WORLD - £7.00 KEY TOPICS CES 1995 6C33C revisited DIY DAC The Mach I acoustic reference Notes on the Edgar horn Tube Fest code:PFV05N05   price exc. p+p UK/EUROPE/WORLD - £7.00 KEY TOPICS The higher End 6C33CB amp DIy phono amp The disadvantages of SE design Upgrading the ET II Audiophile collector   Positive Feedback vol.6, no.1     code:PFV06N01   price exc. p+p UK/EUROPE/WORLD - £7.00 KEY TOPICS Tube Testing How to review the reviewer Tube substitutionfor the 90s Designers notes Advantages of SE topology Vinyl cheapstakes

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