Dr. Fischer Bulb for Minox Enlarger

Discussion in 'Minox' started by mtc photography, Aug 23, 1999.

  1. Minox Enlarger Lamp

    • Dr. G. Fischer 6V/6A/3A autolicht( automotive light bulb )
      Yellow/green box--old package ( for 6V6A and 6V3A bulb)
      • Dr. Fischer 6V6A Special Lamp White box--new package
        • Base: Single.Contact Bayonet 15mm diameter
        • Filament coil center length 3mm/7 turn(for 6V6A)
        • Filament offset from center: 10mm
        • Filament to contact distance 35 mm.
        • Filament orientation: parallel to bayonet pins
        • Bulb Height 55mm
        • Bulb width 32mm
        • Life: 100 hours
        • Made in Germany
  2. The bulb currently sold by MPL is a 6V3A in the yellow and green
    Autolicht box. All measurements are the same as the 6V6A lamp described
    by Martin Tai.
  3. The yellow green 'Autolicht' bulb is old package, as 6v car tail light vanished long time ago.
    Dr. Fischer 6V3A bulb and 6V6A bulb with 10mm offset, all works well with Minox enlarger.
    Old Fischer 6V6A lamp markings:
    • Yellow/green Autolicht box, stamp 6V 6 Amp.
    • Silk screen 6V6A 1521 on bayonet lamp base
    • New Fischer 6V6A lamp markings:
      • Green 'Dr. Fischer' white box, stamp 6V 6 Amp.
      • Concave stamp on bayonet lamp base: 6V 6A 5A (?)
  4. Dr. Fischer 6V5A Bulb for Minox Enlarger I

    • Single contact bayonet, diameter 15mm, silk screen "6V 5A 1521"
    • Glass bulb diameter: 19 mm
    • Height: 55 mm
    • Filament coil to contact: 35mm, offset =0.
    • Filament coil 5mm 11 turns.
  5. Fischer Lamp vs Other Lamps
    The following picture shows clearly the differences between Fischer 6V6A bulb and other replacement bulbs, for example, GE 1133 6.2 V 3.9A bulb.
    • GE 1133 bulb filament is off focus by 10mm
    • GE 1133 is off axis by 5 mm
    • GE 1133 filament is perpendicular to bayonet keys, while Fischer one is parallel.
  6. One possible source of Dr. Fischer lamp is
    Professional Lamps Inc

    580 Park Ave
    Freehold, NJ 07728
    732-963-5556 fax
    specialty bulbs: graphic arts, medical, scientific, photographic, state and studio, cinema, audio visual and photo-exposure
  7. Professional Lamp Inc In China

    Professional Lamps & Optics Co., Ltd.
    XingCheng Bldg. Room 1102
    JiangNin Road 167
    200041 Shanghai, PR China
    Tel: +86-21-6271 4033
    Fax: +86-21-6255 6587
    Professional Lamps & Optics Ltd. Unit 1905, Billion Trade Centre
    31 Hung To Road, Kwun Tong
    Kowloon, Hongkong
    Tel.: +852-2174 0808
    Fax.: +852-2174 0606

  9. A distributor of Dr. Fischer Lamps in Germany

    Rotwandstr. 16 <p>
    D-82049 Pullach <p>
    Tel: +49-(0)89-749860-0 <p>
    Fax: +49-(0)89-749860-10 <p>
  10. Specification and Drawing of Dr Fischer Special Lamp

    Dr Fischer Lamp Drawings
    Click on the part number to obtain drawing However, many drawings are missing.
  11. Life of Dr. Fischer Lamp ?

    The life of Dr. Fischer 6v6a lamp for Minox enlarger is extimated to be about 100 hours, base on similar Fischer projector lamp of similar wattage:
    Life of projector lamp
    A Fischer lamp if used with care ( ie, turn off the enlarger lamp when not exposing on photographic paper ) can last a long time
    One print takes about 5 to 10 secs. Conservatively, let us say 20 sec, then an 100 hour Dr. Fischer bulb may last 100 x 60 x 3 = 18,000 prints !
    The estimated 18,000 to 20,000 prints per Fischer lamp is based on using the lamp at full power. Minox enlarger has a HI-LOW switch. For enlargements under 4x6" it is best to use low power setting. Under low light, a Fischer lamp may last twice as long: 40,000 3.5x 5" prints or four hundred boxes of 3.5x5" paper I still use the same lamp which came with the used Minox enlarger II; and it is quite possible that this lamp was with the original owner since day one.
    But if you left the enlarger lamp on for days, then it can burn't out in a couple of days.
    Since Dr. Fischer bulb is hard to find, buy one more spare as backup, you will be safe for a long time.
  12. SWS has Dr. Fischer 6v6a lamp in stock
  13. 6v6A OR 6V3A, which was the original ?

    According to Emanual: Minox Guide, the original lamp came with Minox enlarger was 6V6A lamp, with 'transverse" filament pointing downward. Emanual's Minox Guide is the only Minox book I have seen which provided a drawing the lamp used in Minox enlarger ( with transverse filament ) Keisermeir :Small Minox Big Picture also mentioned Minox enlarger used 6v6A lamp, but no picture or drawing of lamp
  14. Dr. Fischer 6V6A lamp can be special ordered from Fischer Special
    Lamp GmbH, minium order 250 pieces at 40 DM each, shipping extra
  15. Dr. Fischer 6v6a LAMP is available from Richard Schahl Spezial Lamp International
    <p> Tel 49-89-7498600
  16. I just picked up #1129 6.4V bulbs at the local pep-boys. They are
    made by Sylvania and 2 cost about $3. The filament is not offset,
    and it is perpendicular to the bayonet pins but is approximately the
    same depth as that of the Fischer bulb. I tested these bulbs and
    have determined their output to be about 24 watts or about 4 amps.
    These work acceptably in the Model III enlarger I have as a
    substitute for the Fischer bulb if none is available and is just as
    bright as the 6V 3A bulb from MPL. I am really not sure about the
    need for the offset filament...I saw a photo of a bulb in one of my
    old instruction manuals, one of the original model II manuals which
    called for a 6V 5A bulb which didn't seem to have the offset
    filament, so who knows how critical this is? Like I said, the
    sylvania bulb is an acceptable substitute in my opinion if no OEM
    Fischer bulbs can be found...would anyone else like to test one and
    tell me their feelings? If we could find a bulb like the 1129 with
    the filament turned 90 degrees I think it would be better.
  17. Martin Doctor I have a detail analysis of the Minox Enlarger Illumination System
    in which I compare the illumation intensity and eveness of Dr. Fischer 6v6a lamp vs Sylvania 1129 6.4 V 2.63 A and GE 1133 lamp.
    Minox enlarger is a point source light enlarger, the filament must be as close to a point as possible, and must form an image inside the enlarger lens-- that is a precondition for even distribution of illumination; and this requires the filament is possitioned right on the focal point of the collimator.
    My test of Sylvania 1129 and GE 1133 vs Fischer 6v6a indeed shows that Fischer bulb provdes even illumination, the replacement lamp does not.
    I have a box of Sylvania 1129 (ten in a box ) and a box of GE 1133.
    I have only one Dr. Fischer 6v5a lamp, I did not test it
  18. Have Model III, make following observation in attempt to minimise
    impact of vanishing globes on Minoxers.
    Chasing the Fischer bulb seems an expensive way to achieve what is
    essentially a simple matter of placing the collimator lens in a proper
    relationship to the bulb.
    Put another way, forget the bulb and mount the collimator lens 10mm
    closer to the non Fischer lamp using a simple 10mm high tube. Such
    tube can be made to lock onto the existing collimator support with
    minor or no alteration. A disc placed on top of the tube can provide
    an identical collimator lens mounting to the existing plate.
    REMEMBER, if you do this, DO NOT TO FIT the Fischer bulb when using
    the 'tube' else it will likely hit the collimator lens or the element
    will be so close as to possibly cause it to crack from heat.
    Bulbs need not cost USD50 ever again, that I note is what some hopeful
    is putting as the first bid price on ebay. Done neatly the enlarger
    need not stray from its original condition.
    It would have been nice if the collimator plate could simply have been
    inverted - that would have moved the lens 10mm toward the lamp. But
    the internal lamp shield wont allow this - it would have been so neat.
  19. Dr. Fischer 6V 6A Ba15s PLI part number : LN-066/18
  20. 6v3a 6v6a Minox enlarger bulbs on ebay


  21. http://www.8x11film.com sells Dr. Fischer bulb for Minox enlarger
  22. US source of Dr Fischer bulb for Minox enlarger:

  23. In Nov 2002, a Minoxer contacted Debi Meyer at Professional Lamps, Inc. at 800-548-3626 or 732-863-5555, and was quoted a price of $19.50 for The 6V6A bulb for the Minox enlarger (internal part
    number LW-066/18)
  24. [​IMG]Three different packaging of Dr Fischer bulb

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