Toshiba Ouput Tranistors 2SD424 & 2SB554 (many Adcoms)

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  • Systems
    Systems Posts: 14,873
    edited January 2008
    heiney9 wrote: »
    To my knowledge he was involved only with the 565/585 amps. Those amps were designed exclusively by Yung and Campos.
    Thanks for the informed reply.I thought WJ would have been a natural as a pre amp man considering his vast knowledge of IC op amps.It is an interesting contrast between WJ and NP .WJ uses op amps and gets great results from them ,but NP would not be caught dead using the things prefering instead to go with much simpler discrete circuits and its hard to argue with his results.
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    fredv wrote: »
    GV, good reading links, thanks!!
    Your welcome.Yes there is some good info on that site.
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    I got them!!!

    Three days older than dirt direct from Toshiba addressed to Adcom in NJ:D
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • Dave38
    Dave38 Posts: 101
    edited January 2008
    The folks at Adcom didn't even know the size of the Toroid in the GFA-7700 or the GFA-555II amplifiers. :rolleyes:
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  • Dave38
    Dave38 Posts: 101
    edited January 2008
    heiney9 wrote: »
    One of the main reason's the 555 II was changed and Darlington output stage was added as well as a beefier tranny and larger heat sinks was solely so they could boast it's ability to drive a 2 ohm load continuously. No other reason as it didn't really improve on the original 555 beyond that goal.

    Do you know the rating or size of the toroid in the GFA-555II?
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    No Idea.

    Sorry dave
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • Dave38
    Dave38 Posts: 101
    edited January 2008
    The GFA-555 has a 700VA toroidal transformer so I'm thinking the GFA-555II has the same.
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  • heiney9
    heiney9 Posts: 25,445
    edited January 2008
    Dave38 wrote: »
    The GFA-555 has a 700VA toroidal transformer so I'm thinking the GFA-555II has the same.

    It is larger but I don't know off the top of my head. Let me do some digging and see if I can come up with it. It seems like the series II had 750 or 780VA. It's not a lot larger but it is a little beefier than the original.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    Dave38 wrote: »
    The folks at Adcom didn't even know the size of the Toroid in the GFA-7700 or the GFA-555II amplifiers. :rolleyes:
    Wow this and the lame reply in post #15 does'nt instill much confidence.They should have engineering documentation of EVERYTHING they ever built.
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  • heiney9
    heiney9 Posts: 25,445
    edited January 2008
    GV#27 wrote: »
    Wow this and the lame reply in post #15 does'nt instill much confidence.They should have engineering documentation of EVERYTHING they ever built.

    Sounds more like laziness on the service person's part.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    GV#27 wrote: »
    Wow this and the lame reply in post #15 does'nt instill much confidence.They should have engineering documentation of EVERYTHING they ever built.

    Like Carver Does:rolleyes: I am also pretty sure that Adcom either sold out to a parent company, or had a big change in management. I stand behind the the quality of the older amps fully. Not everyone hooks people up like Polk. I think we get kinda spoiled by the CS here.

    Edit
    I just read post 15, and it was a "sales engineer". If it is info you really need I would ask to go further up the chain. You can also get repair manuals online that have most specs, but I am not sure if they have the trans former specs.

    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    Pics added.
    See post 1:)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • Dave38
    Dave38 Posts: 101
    edited January 2008
    heiney9 wrote: »
    Let me do some digging and see if I can come up with it.
    H9

    Thanks.
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  • Dave38
    Dave38 Posts: 101
    edited January 2008
    ben62670 wrote: »
    Edit
    I just read post 15, and it was a "sales engineer". If it is info you really need I would ask to go further up the chain. You can also get repair manuals online that have most specs, but I am not sure if they have the trans former specs.

    Ben

    A sales Engineer is who you reach when you email Adcom.
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    http://www.diyaudio.com/forums/showthread.php?postid=1407264#post1407264



    201a_1.JPG
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • doxquzme
    doxquzme Posts: 3
    edited January 2008
    I am not mistaken, the 545 i and ll, 555, l and ll, the 565 and 585 share the same "type" tranny's, that is that is, silicon PNP tripple difused type as apposed to mosfet's. THe 5300, 5400, 5500, 5503, 5800, 5803 and the 5802 all use mosfets so these would not be suitable replacements for that series.
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  • doxquzme
    doxquzme Posts: 3
    edited January 2008
    I am not mistaken, the 545 i and ll, 555, l and ll, the 565 and 585 share the same "type" tranny's, that is that is, silicon PNP tripple difused type as apposed to mosfet's. THe 5300, 5400, 5500, 5503, 5800, 5803 and the 5802 all use mosfets so these would not be suitable replacements for that series. Here is a link to toshibas data on theses. http://www.datasheet4u.com/html/2/S/B/2SB554_Toshiba.pdf.html
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  • heiney9
    heiney9 Posts: 25,445
    edited January 2008
    doxquzme wrote: »
    I am not mistaken, the 545 i and ll, 555, l and ll, the 565 and 585 share the same "type" tranny's, that is that is, silicon PNP tripple difused type as apposed to mosfet's. THe 5300, 5400, 5500, 5503, 5800, 5803 and the 5802 all use mosfets so these would not be suitable replacements for that series.

    You are correct as to the "type" (bi-polar) but the 535, 545, GCA-510 and series II don't use the T03 metal can encased tranny's. They all use bi-polar tranny's as opposed to the 5xxx series which uses Mos-Fets. The 555, 565 & 585 use the type Ben purchased. The 555 II used Darlington pairs as well and I believe still uses the this type (T03 metal cased bi-polars).

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • jakelm
    jakelm Posts: 4,081
    edited January 2008
    Are the Mos-FETS better? You see alot of amps bragging about MOS-FETs installed.
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  • heiney9
    heiney9 Posts: 25,445
    edited January 2008
    jakelm wrote: »
    Are the Mos-FETS better? You see alot of amps bragging about MOS-FETs installed.

    No way to say.........Do some research and see what conclusion you come to. I like Bi-polar's as a general rule but it all comes down the design and execution of the topology.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    jakelm wrote: »
    Are the Mos-FETS better? You see alot of amps bragging about MOS-FETs installed.
    No they are not inherantly better than bi polar transistors,it just depends on the skill of the engineer using them they are implemented.
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    Too funny.
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    5800 uses TO3
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    ben62670 wrote: »
    5800 uses TO3
    Thats just the case style,bi polars and Mos Fets come in TO3 metal can styles.
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    jakelm wrote: »
    Are the Mos-FETS better? You see alot of amps bragging about MOS-FETs installed.

    Misfits:D, are easier to develop drive stages, are cheaper to produce than the metal can counter parts. I have had both, and I'll take the cans any day with a big fat transformer, and big caps;)
    MY 5800 has 32 cans (TO3's):D 5802 =mosfet.
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    Ben
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    GV#27 wrote: »
    Thats just the case style,bi polars and Mos Fets come in TO3 metal can styles.

    They are actually hexfet. I like my 585 over my 5800 anyday.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    jakelm wrote: »
    Are the Mos-FETS better? You see alot of amps bragging about MOS-FETs installed.

    You also see a lot of bragging about switching/digital/regulated power supplies, and I thing they suck!
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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    Ben
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    ben62670 wrote: »
    They are actually hexfet. I like my 585 over my 5800 anyday.
    Huh:confused:Your amp uses bi polar type transistors that come in a TO3 case style.Mosfets or( Hex Fets as IRC calls them) are also available in TO3 case styles.However most manufacturers are now using the TO3 P plastic case(flat and black with 3 pins) for both mosfets and bi polars.
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  • Systems
    Systems Posts: 14,873
    edited January 2008
    ben62670 wrote: »
    You also see a lot of bragging about switching/digital/regulated power supplies, and I thing they suck!
    They are cheaper and more efficient but a good old fashioned linear supply still wins the day.
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  • ben62670
    ben62670 Posts: 15,969
    edited January 2008
    IRF244, and IRF9240
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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