[TechAssist] Re: HOT subs in general question
- From: Bil Green <tv.vcrrepair@xxxxxxxxxxx>
- To: Jorge Camboni <techassist@xxxxxxxxxxxxx>
- Date: Thu, 31 Jul 2003 00:04:36 -0700
The BUH717 is rated at 1700V. The 1500V HOTs may not last long.
Hard to believe that Sony recommends a HOT replacement which
does not have a damper diode (when the original one does).
I recommend the D1884 through D1887 (no damper diodes) and
D1878 through D1881 (have damper diodes) for most HOT subbing.
You also need to have a Japanese transistor manual so you can
look things up. If you buy these as original Sanyo, Toshiba,
etc. you will find that they work for almost any HOT in
direct view and PTVs.
Saves lots of money and you rarely have to special order a
HOT. Using a sub which has the same amp rating as the original
is the key. More voltage and faster switching speeds is OK.
Lower wattage rating is OK also. HOTs are off most of the time
(~12us on, ~55us off).
--
Best regards,
Bil Green
2001 TV VCR
Mammoth Lakes, CA 93546
760-934-2001 mailto:tv.vcrrepair@xxxxxxxxxxx
Wednesday, July 30, 2003, 7:07:23 PM, you wrote:
JC> Hi Tony. You're using a 1881 subbing a BUH517
JC> but the BUH517 HAS NO DAMPER. neither the C5148,
JC> so you're adding another damper to the circuit (and it works!!)
JC> which is not the best way, i believe, In those cases you should
JC> use D1885/86/87. Strangely enough, Sony reccomends subbing
JC> d1941 (damperless) for c4927 (damper included)
JC> I had not noticed any difference between 1879 and 1881 if the 79
JC> stands the current. (it will in most cases). According to Sanyo, there
JC> is no difference between 78/79/80/81 excepting the current rates
JC> and the power handling. FT (gain/bandwith product) is the same,
JC> so dc beta is.
JC> Jorge
JC> At 07:14 p.m. 30/07/03 -0500, you wrote:
>>Hey Phil I have been using the D1880 and 1881 for many subs, They do seem to
>>keep the temp down and last longer. must haves in my book BUH517, C4927,
>>C5148 ( I dont like using subs on sony to many bad memorys.)
>>
>>Tony Saracco
>>TCS ELECTRONICS
>>Elgin , IL 60120
>>847-695-1928
>>tcselectronics@xxxxxxxxxxxxxxxx
>>----- Original Message -----
>>From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Wednesday, July 30, 2003 12:30 PM
>>Subject: [TechAssist] HOT subs in general question
>>
>>
>> > A tech friend says if he cannot get, or ID an HOT he will sub a
>> > 2SD1881. Says thiis 1881 seems to be a general heavy transistor for at
>> > least test/estimate purposes.
>> > Yesterday he had a Sharp with bad HOT 2SD2586.No subs avail. OEM a week
>> > away.
>> > Used an 1881 and ran cool.
>> > I want to improve my TV HOT selection bin. Is there a certain selection
>> > that are "must haves"?
>> > Phil Bader
>> > --
>> > Philip Bader
>> > Jan Phyl TV Inc. (estab. 1976)
>> > 3420 Recker Hwy. Winter Haven, Fl. 33880
>> > Fax (863) 299-8821
>> > email: tjanphyl@xxxxxxxxxxxxxxx
>> >
>> >
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JC> Jorge Camboni, GY Electronics, Richardson, TX
JC>
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