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  1. Replies
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    It's been years since I reverse engineered and...

    It's been years since I reverse engineered and built my own BGW 250C's and 202 pre amp in the late 70's, I was working for Philips Micro Electronics at the time here in AU, manufacturing semi's for...
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    These are a great amp, even by today's standards....

    These are a great amp, even by today's standards. I replaced my BGW's with 2 x new Bryston 4BSST'2 and I have to be honest ..... there isn't the AU$11,000.00 improvement in sound quality that I...
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    From memory the difference between the 202 and...

    From memory the difference between the 202 and 203 models is one uses linear faders for tone and volume and the other uses rotary pots (I use this version), the linear fader version also uses a...
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    Drawings

    Hope these CAD drawings help .... the original material looks like high density particle board to me not MDF ........cheers Peter
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    DC Bias

    I concur with just4kinks … most of the “coupling” caps are forming part of the filter sections ….. if you have removed them it might be worth doing a frequency sweep to see what you have ended up...
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    Truextent Be diaphrams for 2426

    Hi ... has anybody heard when Be replacement diaphrams for the 2425/2426 will be available from Truextent, as I recall they were going to have them by mid year ??:dont-know:
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    :lol_fit::rotfl::cheers:

    :lol_fit::rotfl::cheers:
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    You bet ya :D .... you might end up being the...

    You bet ya :D .... you might end up being the biggest mover of these diaphragms ;)
  9. Replies
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    Ahh ... the problem with the written word over...

    Ahh ... the problem with the written word over the spoken word, all inuendo is lost :p
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    Excellent Guido :applaud:co-operation on this...

    Excellent Guido :applaud:co-operation on this site can be outstanding at times :yes: now all we need is someone with Clio and the spare time and the willingness to assist :bouncy:
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    That will be excellent if this is correct, do we...

    That will be excellent if this is correct, do we have any idea on prices yet? ..... any owners of LEAP interested in re-designing the crossover network for the 4430/4435 :bouncy:
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    One years wait for 2425/6 diaphragms

    For those who are interested I had this reply back from Brush Wellman yesterday ...... Quote ...

    "We currently have 4 inch diameter voice coil replacement diaphragms available and we are...
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    Now getting back to topic

    Now getting back to the original topic .... any other experiences with the 4B ST anyone can share ?
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    Cheers for the info Rich ..... any designs with...

    Cheers for the info Rich ..... any designs with higher power? (I might be able to design a water jacket around the heatsinks to preheat my mains water before it goes into the hot water service) :p
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    Rich ... is the PASS Class A amp your building...

    Rich ... is the PASS Class A amp your building schematic and layout available to the general public and if so where ? :cheers:
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    Rich ... am I wrong but I would have thought the...

    Rich ... am I wrong but I would have thought the 3B ST and the 4B ST would have sounded the same, just one with more output power than the other, I don't have the schematics in front of me but...
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    Any experience with Bryston 4B ST Amps

    Just interested in anybody's experiences with the Bryston 4B ST sonic quality, I was looking at using 1 for LF and the other to drive the HF sections on my 4435's .... all comments and opinions...
  18. I use BGW 750D's rated at 275W RMS into 8 ohms...

    I use BGW 750D's rated at 275W RMS into 8 ohms on my 4435's and have also used the AM 1K2 at 400W RMS into 8 ohms on them as well. The lower power rated BGW provides unquestionably more dynamic LF...
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    Congrats :applaud:..... my favorite stuff...

    Congrats :applaud:..... my favorite stuff ........ You know a lot of the 250's and 750's were sold down here in Australia in their day and they hardly every re-surface for resale ... that says...
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    Final Comment

    I think for 4430/4435 owners who are contemplating this exercise it is important for them to acknowledge that for whatever reason that some people have tried bi amping these and have concurred with...
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    Oh sh$t ..... appologies... I suffer from :blah:

    Oh sh$t ..... appologies... I suffer from :blah:
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    I’m sorry if you have misunderstood Mr. Widget,...

    I’m sorry if you have misunderstood Mr. Widget, the reason for using 70 Hz and 10 KHz is purely and solely because if you analyse the voltage drives for the 4430/4435 crossover cards then you will...
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    Sorry .. Typo lobing with one b ....... here are...

    Sorry .. Typo lobing with one b ....... here are a couple of links that may explain it for you http://www.audioholics.com/education/loudspeaker-basics/filter-crossover-types-for-loudspeakers...
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    Yes fair comment, but for this to be so the room...

    Yes fair comment, but for this to be so the room would need to have an upward or downward slope starting at 1 kHz in this instance with the 4430/4435, this method you suggest may be more easily...
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    Slight disagreement on the function and the...

    Slight disagreement on the function and the intention of the electronic crossover, this is NOT to provide some sort of room eq .... don’t forget this is a singular crossover point of 1kHz, this will...
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