Results 1 to 11 of 11

Thread: Hiwatt dr201 PT

  1. #1
    Member
    Join Date
    Jun 2019
    Location
    FRANCE
    Posts
    84
    Thumbs Up/Down
    Received: 10/0
    Given: 8/0
    Rep Power
    0

    Hiwatt dr201 PT

    Hi,
    i was looking for powerfull PT, and i found this one https://www.tube-town.net/info/daten...t-dr201-pw.pdf

    I'm surprised to see the ratings of the high voltage windings, 1,3 A for a 200w amp, which is making 660 VA.

    Is'nt it too big? I would have said 700/800mA, not 1,3A.

    And the 400w version is (only) rated 1,5 A for the same voltages, why it's not 2,6A ? It's 760 kva for a 400w.

    There is no real ratio ?

    What do you think?

    0 Not allowed! Not allowed!

  2. #2
    Senior Member
    Join Date
    Mar 2008
    Posts
    803
    Thumbs Up/Down
    Received: 96/0
    Given: 214/0
    Rep Power
    12
    Hi, I think they sell the same transformers as in link below. There are direct replacements. The specs are same,The price is same. Seems are made in Italy and no Chinese one. But maybe I.m wrong and it is their product...who knows... Usually get very good stuff from TT. Lemberg. Exceptional packing and very fast shipping. Go ahead !

    Just for reference:
    http://www.inmadout.com/T-power.asp
    http://www.inmadout.com/T-set.asp

    0 Not allowed! Not allowed!
    Last edited by catalin gramada; 09-08-2019 at 03:40 PM.
    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

  3. #3
    Supporting Member
    Join Date
    Mar 2018
    Location
    Germany
    Posts
    2,262
    Thumbs Up/Down
    Received: 1,721/1
    Given: 974/2
    Rep Power
    5
    In cannot completely explain the current ratios in the specs. But I assume that the PTs are faithful reproductions of the originals.

    Just so much: Secondary RMS current times secondary RMS voltage is not real power but apparent power, which is higher than real power. The ratio between real power and apparent power is called power factor PF (<1). The PF increases (gets closer to 1) with higher DC current and same filter capacitance. So this might partly explain why the current rating doesn't double.

    1 Not allowed! Not allowed!
    - Own Opinions Only -

  4. #4
    Member
    Join Date
    Jun 2019
    Location
    FRANCE
    Posts
    84
    Thumbs Up/Down
    Received: 10/0
    Given: 8/0
    Rep Power
    0
    They are cheap, about 15 € per kilo of copper, good price :-)

    0 Not allowed! Not allowed!

  5. #5
    Senior Member
    Join Date
    Mar 2008
    Posts
    803
    Thumbs Up/Down
    Received: 96/0
    Given: 214/0
    Rep Power
    12
    Man, I tried to take a look on You site to see what you,re doing. Is almost impossible, is full with crap promos adds. Make it little clear...

    0 Not allowed! Not allowed!
    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

  6. #6
    Member
    Join Date
    Jun 2019
    Location
    FRANCE
    Posts
    84
    Thumbs Up/Down
    Received: 10/0
    Given: 8/0
    Rep Power
    0
    Quote Originally Posted by catalin gramada View Post
    Man, I tried to take a look on You site to see what you,re doing. Is almost impossible, is full with crap promos adds. Make it little clear...
    Oh yeah ! Don't you know addblock ?

    0 Not allowed! Not allowed!

  7. #7
    Senior Member
    Join Date
    Jul 2011
    Location
    Adelaide, South Oz
    Posts
    750
    Thumbs Up/Down
    Received: 85/0
    Given: 4/0
    Rep Power
    9
    These Transformers 2 x High Voltage Windings are both intended for voltage doubler power supplies, therefore the current ratings are X2 what you would otherwise expect.
    Cheers,
    Ian

    0 Not allowed! Not allowed!

  8. #8
    Member
    Join Date
    Jun 2019
    Location
    FRANCE
    Posts
    84
    Thumbs Up/Down
    Received: 10/0
    Given: 8/0
    Rep Power
    0
    Quote Originally Posted by Gingertube View Post
    These Transformers 2 x High Voltage Windings are both intended for voltage doubler power supplies, therefore the current ratings are X2 what you would otherwise expect.
    Cheers,
    Ian
    Voltage doubler ? No! It's for dual rail power supply... https://hiwatt.org/Schematics/DR_200wPS.pdf

    0 Not allowed! Not allowed!

  9. #9
    Senior Member
    Join Date
    Mar 2008
    Posts
    803
    Thumbs Up/Down
    Received: 96/0
    Given: 214/0
    Rep Power
    12
    double post , sorry

    2 Not allowed! Not allowed!
    Last edited by catalin gramada; 09-09-2019 at 03:28 PM.
    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

  10. #10
    Senior Member
    Join Date
    Mar 2008
    Posts
    803
    Thumbs Up/Down
    Received: 96/0
    Given: 214/0
    Rep Power
    12
    It,s a "splitted" PT secondary, as well can run the amp in class B operation with max voltage the tubes can handle( think 800V to EL34) but keeping screens to a safe 400V. See old sixties Dynacords (Pinternagel designs) did it , get 100w from two EL34 at 800V. Dynacord used those powerstage circuit to death, even in semiconductors era. It seems it was very reliable.And we talk about Straubing factory not a garage production.You can stack two transformers as well, but is more convenient so.
    ...dual rail, yes

    1 Not allowed! Not allowed!
    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

  11. #11
    Member mhuss's Avatar
    Join Date
    Nov 2006
    Location
    West of Philly
    Posts
    312
    Thumbs Up/Down
    Received: 23/0
    Given: 1/0
    Rep Power
    14
    Also, both the screen and plate current are flowing in the "bottom" half, so add another 10-20% for that. Plus, you don't really want to run the PT at 100% - think of the doom metal people running these things with everything on "10."

    0 Not allowed! Not allowed!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Hiwatt T 40
    By Biascomp in forum Schematic Requests
    Replies: 0
    Last Post: 06-14-2019, 05:03 AM
  2. How much NFB in a Hiwatt?
    By Gaz in forum Theory & Design
    Replies: 4
    Last Post: 07-06-2013, 03:27 AM
  3. I need help with a Hiwatt amp
    By Gonzalizimio in forum Maintenance, Troubleshooting & Repair
    Replies: 10
    Last Post: 08-15-2012, 11:25 PM
  4. Hiwatt DR201
    By Reimer in forum Guitar Amps
    Replies: 2
    Last Post: 09-21-2010, 08:02 AM
  5. HiWatt DR201 Bias Problem
    By Jay D in forum Maintenance, Troubleshooting & Repair
    Replies: 1
    Last Post: 02-23-2010, 06:37 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •