Hammond Mfg.- Classic Tube Output Transformers (Overview).pdf

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9/26/2019
Hammond Mfg. - "Classic" Tube Output Transformers (Overview)
"Classic"
Tube Output
Audio
Transformers
Overview
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Overview
Audiophile Tube Output Transformers
Whether you are into the clean, free spirited "Single Ended" tube output
or high efficiency, high power, "Push-Pull" audio, we have the output
transformer for you.
We have been producing tube output transformers continuously for over
75 years, constantly improving and tweaking their performance. The
output transformer is one of the most critical components in a audiophile
amplifier. These excellent designs have survived the years and have enjoyed
a recent resurgence along with the tube industry.
Please note, our specifications are at
FULL OUTPUT
power. Many
"newbies" to the industry use frequency specification data at milliwatt
ranges to inflate their claims. Check carefully when comparing
manufacturers specs. We use -1db roll off points to ensure a typical
HAMMOND conservative rating, again at FULL OUTPUT POWER.
To ensure a long life and maximum versatility these units are built to and
tested at a Hi-Pot rating of 2,000 VAC RMS!!!!!
Our transformers are of EI laminated design, we do not offer toroidal
designs due to their inability to handle tube imbalance and high
manufacturing cost.
More importantly, our designs are "ear tested". After a new design has
passed our extensive testing, it's got to sound good too, before we put it on
the market! From Bach to rock & three watts to 280 watts, we have your
output transformer IN STOCK.
Single Ended Tube Output Transformers
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Hammond Mfg. - "Classic" Tube Output Transformers (Overview)
These high quality units are
designed for maximum
versatility. Designed for both
triode or pentode operation -
Class A operation. All units
include an optional use - 40%
screen tap (a proven pentode
"sweet spot") for "Ultra-
Linear" operation. The
ratings shown are at full
power and rated plate
current. Available in 25-75 watt models (our
1627-1642 series)
The lamination iron used is a high quality (M6) grade, silicon steel, for low
loss and the lowest possible distortion at bass frequencies. A factory set
core cap ensures against core saturation at full ratings. All single-ended
output models include multiple interleaved windings to maximize high
frequency response. These windings are machine wound with high quality
copper wire.
If you do not need hi-fi ratings or are restoring older equipment using
single ended audio output - refer to our economical
125SE series
optimized
for single ended - universal - general purpose use. Available in 3-25 watt
models.
Push Pull Tube Output Transformers
These high quality units are also designed for
maximum versatility. All units include an optional
use - 40% screen tap (a proven pentode "sweet spot") for "Ultra-Linear"
operation. They are designed to be used with most all power output tubes
available today. The ratings shown are at full power and rated plate
current. We have also added an epoxy potted series to our line for the
ultimate in tube output transformers. Available in 10-280 watt models (our
1608-1650 series).
If you do not need hi-fi ratings or are restoring older equipment using
push-pull audio output - refer to our economical
125 series
optimized for
push-pull - universal - general purpose use. Available in 3-15 watt models.
HAMMOND Interleaved Windings
The reason for our sparkling high frequency performance is the use of
interleaved windings between the primary and secondary. The number of
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Hammond Mfg. - "Classic" Tube Output Transformers (Overview)
interleaved windings is optimized to the size (wattage) of the unit. All high
fidelity output models (both single ended and push-pull) include multiple
interleaved windings to maximize high frequency response. These windings
are machine wound with high quality copper wire The multiple interleaved
secondaries are wound (series or parallel connecting them) to match to 4, 8
or 16 ohm load impedances.
The primaries of each model (including the "single-ended" series) include
Ultra-Linear taps at the 40% point.
Tube Output Transformers - Aesthetics
We have also paid close attention to the "look" of our units as they are as
much on display in some designs as the tubes themselves. Our high fidelity
units are manufactured with high grade laminations (M6) and machine
wound with high quality copper wire. The core is varnished and oven
baked to ensure quiet operation - even at high ambient temperatures. Then
the end bells are bolted on. These end bells are finished in a tough, low
gloss, black powder paint finish to resist scratching.
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Copyright; © 1998-2004 Hammond Mfg Co Inc
URL:
http://www.hammondmfg.com
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