Paleo-Electronics

Clueless Idiots and High Voltage Vacuum Tubes Really Do Mix!

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Entries Tagged as 'Gear'

New Find : A Totally Different Crestline GA-5 Schematic

August 7th, 2010 · 3 Comments · Amp Repair, Gear, Schematics, Skylark Rebuid

A ‘new’ schematic for GA-5 Crestline amps has been discovered.

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Rebuilding a Skylark

November 28th, 2009 · 2 Comments · Amp mods, Amp Repair, Gear, Skylark Rebuid

Regular readers (hahaha…. I kill me) will remember that I bought two Gibson Skylarks.  One of which I fixed immediately and the other sat waiting.    This is a story about the other. This is a Gibson Skylark in the “Crestline” series.  It is one of the many amps released with the GA-5T model number.   […]

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The Real McTube wrap up

October 10th, 2009 · 2 Comments · Gear, McTube

Sorry to both of you who read this.. I’m keeping busy :-) So where are we ?   I built out my McTube clone and it actually worked.   Here are a couple of pictures : So yeah, she’s nice looking ..  I’m a fan of the clean look.   The back has the instructions / names of […]

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A Game Changer – The Gibson GA 20 RVT Initial Review

April 23rd, 2009 · 11 Comments · Gear, Songbird

I have purchased the best amp I have ever heard.    This is a 2006 Gibson GA 20 RVT.   It’s not perfect, I might have to mod it, but I am definitely in love.   My strategies about building the Songbird and other things are all up in the air now. Let see why..

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Real McTube : Some Notes on Rectification

March 29th, 2009 · No Comments · Amp mods, Gear, McTube

The Real McTube II was designed with rectified filament voltages because Fred found that the original McTube could be noisy if not done impeccably well.    The original McTube (appearantly) had the 12 V AC from the transformers going directly to the heaters on the tube. That is the way it’s always done on the old […]

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Real McTube : We Have Power!

March 29th, 2009 · No Comments · Gear, McTube

Ok.. finally got off my ass and wired up the transformer and finished the power section.    That little transformer was cheap and is dead on spec.    The rest of my components ..  eh. So the B+ voltage is expected to be around 140V with load and 150V unloaded.  I got 173V unloaded so I might […]

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Real McTube Calculations : Getting Started

January 6th, 2009 · 7 Comments · calculations, Gear, McTube

So.. with a transformer on the way, it’s time to start fooling with the calculations.   The article by Fred Nachbaur gives you a lot of info, but not a full analysis. I’m not gonna do a full analysis either, but I want to cover some of the basics, and then measure once we are built.   […]

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McTube : Transformer is on the way.

January 5th, 2009 · No Comments · Gear, McTube

At some point recently, I realized that my transformer for the Real McTube had not yet arrived.  Why I needed a new one is chronicled here.   A bit of looking around showed me that the reason I was not in possession of the transformer was because I never ordered it. I was talking about the […]

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Introducing The Amp Computer!

December 18th, 2008 · No Comments · Amp Computer, Gear, Songbird

As I alluded to earlier, there are a thousand options that I want to try with the Songbird.   I only got through a third or so of them before I stopped writing and this is nearly the smallest simplest amp you can make (although I have a plan there too!) Now many of the options […]

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Songbird : Requirements II – Pre Amp Bias

December 13th, 2008 · 2 Comments · Amp mods, Gear, Songbird

Ok, so clean power and rectified heaters and some other stuff were covered in the previous requirements post. Tube Biasing – 1st Stage As I understand it from my readings, the standard way of biasing, self biasing, is a complex reaction.   Essentially as the power drawn from a tube increases, the bias goes more […]

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