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Old 14th December 2004, 06:00 AM   #1
rdf is offline rdf  Canada
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Default Mullard 3-3 Question

My chassis is done but before soldering in the components, does anyone know the history of the two Mullard 3-3 schematics available online? Version A appears to be from the original article and B from some unspecified later date. I've prototyped both and A measured significantly less distortion, and I recall it sounding better too. Anyone know the origins of the B version?

Version A
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Old 14th December 2004, 06:02 AM   #2
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And Version B.
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Old 14th December 2004, 07:19 AM   #3
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I have yet another schema, which I believe to be the same as in Mullard's publication:
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Old 14th December 2004, 07:22 PM   #4
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Quote:
Originally posted by ray_moth
I have yet another schema, which I believe to be the same as in Mullard's publication:
Thanks Ray, that's version B with tone controls. Is that from the 1959 'Mullard Tube Circuits for Audio Amplifiers'? Version A is from a Radio Constructors article dated roughly the early fifties. I'm trying to determine which is the newer and, if B, figure out why I found its performance inferior to A.
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Old 20th December 2004, 01:36 AM   #5
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Quote:
Is that from the 1959 'Mullard Tube Circuits for Audio Amplifiers'?
Yes, I built this in 1963 as a record-player amplifier, using Mullard's book. It worked OK but it had only a small eliptical speaker and was driven from a crystal pickup (ugh!), so I wasn't able to evaluate it properly.
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Old 21st December 2004, 03:49 AM   #6
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Thanks again. Maybe the redesign was due to changes in tube parameters, field failures, or something else unrelated to raw performance. I think Version A's the one then. Some LTSpice results suggest a simple front end change can yield a big payback on A as well. Experiment time!
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Old 14th July 2013, 07:52 AM   #7
M Gregg is offline M Gregg  United Kingdom
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Hello rdf,

What was the outcome of your experiments?

Which circuit did you think was the best A or B and why?

Any thoughts on the level of gain between the two?

Thank's for your thoughts

Link,
http://vintageradio.me.uk/amplifier/mullard33.htm


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Old 14th July 2013, 02:25 PM   #8
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NB,

I have no connection to the link in the previous post, Its just for interest.

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Old 18th July 2013, 06:39 PM   #9
M Gregg is offline M Gregg  United Kingdom
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OK,

There are two different circuits of the Mullard 3-3 amplifier in this thread.
Has any one built the early version or the late version?

There only seem to be a few changes the anode resistor on the EF86 and the cathode connection on the EL84. (1M and 0.1uf)+ the 1k across the OP Tx.

Please does someone have any ideas why this circuit was modified?
If not does anyone have ideas about circuit operation A verses B?

There must be a reason for the changes.

If not please have a guess..LOL

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M. Gregg
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Old 20th July 2013, 08:07 AM   #10
M Gregg is offline M Gregg  United Kingdom
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Some interesting information,

And PDF files. Sterns etc.

Mullard 3-3 information required - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

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