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Author Topic: 300B upgrade  (Read 20362 times)
Randy in Caintuck
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« on: November 06, 2012, 06:25:39 PM »

My buddy Dave at Parker Audio recently made some modifications to his 300B amplifier.  Since it was very similar to mine, I went to his crib to check it out and see how it compared.  CRIKEY ..... sad to say, it ate the lunch of my poor amplifier .....  Tongue

So ..... the only thing to do was to beg Dave to do the same thing to my amp.
He agreed, and here are the results.  The first thing was a larger chassis.  Next was a "somewhat" beefier power transformer.  Some boutique tube sockets, capacitors and resistors to complete the package and here are the results (during construction) .....

I have provided a picture of the amp before mods for a comparison .....



Larger photo here.



Larger photo here.



Larger photo here.

Hats off to Dave .....  Grin

Randy

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Rega Saturn-R transport
Camelot Uther DAC with Anagram upgrade
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Decware SE84UFO, the Spud, Flea Watt amplifiers
Caintuck Audio Betsy open baffle speakers
Caintuck Audio Alpha open baffle subs
steve f
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« Reply #1 on: November 06, 2012, 08:04:43 PM »

Randy,

Very nice. Kudos to Dave. You can't go wrong with beefy power supplies and extra chassis spacing.

I need the distraction from the election returns.

Steve   Cool
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Henry
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« Reply #2 on: December 30, 2012, 09:32:00 AM »

Hey Randy, any further reports?   Grin

What are the gold cylindrical finned thingies, rectifier???
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sonic
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« Reply #3 on: December 30, 2012, 10:04:09 AM »


He put PT same orientation as OPT?
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Randy in Caintuck
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« Reply #4 on: January 24, 2013, 11:26:50 AM »


Howdy sonic,

Yep ..... and I am aware that the "received wisdom" is to rotate the PT 90 degrees ..... but, this PT has some very serious shielding which prevents interaction between it and the OPTs.

The proof is in the listening ..... on a pair of my speakers that are 99 db efficient, I can shove my ear right up against the driver and essentially hear NOTHING at idle .....  Cool

In addition, the amplifier sounds fantastic .....  Grin

Best wishes,

Randy
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Rega Saturn-R transport
Camelot Uther DAC with Anagram upgrade
La Dolce Audio UA1.5 pentode amplifier
Decware SE84UFO, the Spud, Flea Watt amplifiers
Caintuck Audio Betsy open baffle speakers
Caintuck Audio Alpha open baffle subs
Randy in Caintuck
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« Reply #5 on: January 24, 2013, 01:20:59 PM »

Hey Randy, any further reports?   Grin

What are the gold cylindrical finned thingies, rectifier???

Howdy Henry,

Sorry that it took me so long to get back to you .....  Embarrassed

If I'm not mistaken, those are "metal clad" resistors ..... but, I could be wrong about that.  I am a total dufus (or is that "doofus") when it comes to the innards of an amplifier .....  Wink

See you in May,

Randy
« Last Edit: January 24, 2013, 01:24:19 PM by Randy in Caintuck » Logged

Rega Saturn-R transport
Camelot Uther DAC with Anagram upgrade
La Dolce Audio UA1.5 pentode amplifier
Decware SE84UFO, the Spud, Flea Watt amplifiers
Caintuck Audio Betsy open baffle speakers
Caintuck Audio Alpha open baffle subs
jsn
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« Reply #6 on: May 13, 2014, 12:53:02 PM »

Yeah those pretty gold things are power resistors.  Those cases are good for 50W I think - possibly more when attached to a chassis or heat sink.  They are fairly common at surplus shops and are great for big cathode resistors.  I have also used them as dummy loads for amplifiers.
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coolhand28
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« Reply #7 on: March 01, 2017, 03:48:04 PM »

Always wanted to hear a 300b based amp-bet yours really sounds sweet!!!
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