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Output Transformer Comparison

There were some recent discussion on the quality of the output transformer – vintage vs. modern, etc. It’s often been said that vintage Partidge OPT was hard to beat, but is it true? Pulling data from a couple of sources, I came up with the following comparison chart, it is pretty clear that there is indeed some truth to the Partridge’s legend… -3 dB at 80kHz!

OPT Comparison

OPT Comparison

Sources:

1) Transformer Shootout- Hammond vs Magnequest vs Dynaco vs HW

2) Partridge technical datasheets

NAD: Marshall 5212

Picked one up yesterday, it’s an old solid-state model ca. mid-80’s – one of the JCM800 models, since I have not played an actual tube version of the JCM800, I don’t know if the SS version even comes close to the sound that it produces. Anyway, to my ears, it sounds better than the current SS amps that Marshall are selling – doesn’t hurt the amp is loaded with two Celestion G12M-70’s.

Marshall 5212 Combo

Marshall 5212 Combo

NAD: Brunetti Mille

I just got a vintage Brunetti Mille from Italy, I believe this one is the original version which was modelled after the CAE 3+ SE. It is very well built and came with Ruby 12AX7’s. My initial impression of the unit is very positive, surely better than most of the amps that I have built myself… So the preamp stage do make a big difference, duh!

Before I bought the unit, I was think about building one myself, there are some kits on the market, but after factoring the cost and time, especially the front panel and chassis drilling involved – the price on the used Brunetti was simply too good to pass up. As much as I like DIY, there is no way to make it as professionally looking and robust (unless you have all the necessary machining tools and how to use them) as the factory built unit.

Below are some pictures that I got from net, I actually quite like the unusal blue color of the front panel, it reminds me of the old Orban equalizers that I used to work on – and perhaps will acquire one of these days if the price is right.

Mille with Silverbullet Amp

Mille with the Silver Bullet Amplifier

Very nicely made PCB

Very nicely made PCB, this one with a MIDI interface, which I do not have…

NAD: Fender Excelsior

I got one today with the intention of modifying it into a Tweedle Dee, but before I do that I will play with it for a few weeks, perhaps changing out the speaker and see if the tone could be improved – even with a 15″, the amp still sounds bright to me…

Recording Arts… not!

I don’t know when it started, but it seems that many modern recordings are very poorly recorded or mastered, perhaps it is just the sign of the times, since most people listen to MP3’s on their cheap earbugs, sigh…

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Screenshot - 6_16_2015 , 4_26_46 PM

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