Hammond 1650F Output Transformer

Hammond 1650F Output Transformer

Brand:| Model: 1650
Designed for push-pull tube output circuits, these transformers include 40% screen grid taps for Ultra-Linear operation.
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Weight: 3.95 lbs.  
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Part # 122-125
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Product Details

Hammond 1650F Output Transformer
Hammond output transformers are well known to design engineers and audio hobbiest alike. Proper output transformer design is crucial to the success of an audiophile quality amplifier. Hammond transformer designs have been proven to meet the test of time. Designed for push-pull tube output circuits, these transformers include 40% screen grid taps for Ultra-Linear operation. Black matte finish. Frequency response 30-30,000 Hz (+/- 1 dB Max ref 1kHz at full output power. Suggested tube types: 6L6GC, 6V6, 807, 5881, EL34. 25 Watts 7K ohms CT

Hammond 1650F Output Transformer
  • BrandHammond Manufacturing
  • Model1650
  • Part Number122-125
  • UPC623980301501
  • Product CategoryAudio Output Transformers
  • Unit of MeasureEA
  • Product Rating
    (2 Reviews)
  • Weight3.95 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Hammond 1650F Output Transformer
Hammond 1650F Output Transformer is rated 5.0 out of 5 by 2.
Rated 5 out of 5 by from Pretty Good in a Fender Clone ProjectI realize this transformer should really be judged more appropriately by hifi standards as it includes 40% taps and really would be at home in a hifi rig. However, I used it in a project to clone a 1968 Fender Pro Reverb (didn't use the Pro Reverb replacement transformer because we wanted multiple output impedance taps to drive different speaker arrangements) and it worked very well. Sounds very good in that 'clean' Fender mode. In fact none of us can tell the difference (the power amp and one channel of the pre-amp faithfully follow the Fender schematic). This transformer definitely has a smaller core than the original Pro transformer and therefore is being driven a bit harder than the original, but so far is taking it like a Champ. On the 'drive' channel (which was acheived via a separate pre-amp channel), this little guy really screams. In this case we did keep the tube rectifier so there is probably only about 40 watts of musical power coursing through this transformer on a good day, but it is handling it nicely. The output stage is P-P 6L6's, with 490V B+ and bias set at about 40mA, with approximately 120mA max. Bottom line, for a guitar amp this transformer is working very nicely, hence the good ratings.
Date published: 2010-12-23
Rated 5 out of 5 by from Sounds good so farOnly played through it a little, but had no problems once installed and wired correctly. Keeps up with my PP 6L6GC Output stage and gives the full power to the speaker cabinet. Definitely loud enough for our Les Paul guitar rig.
Date published: 2008-04-08

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Hammond 1650F Output Transformer

I'm rebuilding a kenwood push pull tube amp with 7189 output tubes I believe delivering 20-23watts will this transformer be the best replaceme choice?

Number on old transformer T02-23.
Asked by: Doggonegood
This transformer will work, but you will have to use the secondary leads of the next inpedance down to match the loads properly. Let me explain. Depending on which topology your amp is, the output impedance of this tube is anywhere from 8k to 11k. The primary impedance of this transformer is 7.6k. If you hook a 4 ohm speaker to the 4 ohm tap, you'll be taxing the tubes pretty hard because the reflected total impedance will be lower than the tube's nominal impedance. If you hook an 8 ohm speaker to the 4 ohm tap, the reflected impedance is effectively doubled, making the load much easier to drive. As a side note, there are other transformer manufacturers, like edcor and mercury, who might have a stock transformer that is a better match for your amp. and if not, I know edcor does make custom transformers to your spec.
Answered by: Matt
Date published: 2011-11-30

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