Hammond
"Classic"
300 series, power transformers
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Due
to the large number of Hammond model numbers it is
not possible to keep all items in stock. The
transformers listed below are on stock
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High
Voltage (Plate) & Filament transformers
Hammond "Classic" 300 series
Hammond
"Classic" 300P series
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Type |
VA |
Specification |
Dimensions(mm) |
Weight
(Kg) |
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€
ex.VAT
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€
inc.VAT |
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369BX |
39 |
150V-0-50-150V/86mA,
6,3VCT/2A
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64
x 70 x 78 |
1,04 |
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61.55 |
74.50 |
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370HX |
180 |
275V-0-50-275V/230mA,
5VCT/3A, 6,3VCT/6A
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80
x 106 x 97 |
3,45 |
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86.90 |
105.15 |
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302AX |
198 |
300V-0-50-300V
/ 230mA, 2,5VCT /3A(x2), 5VCT/3A, 6,3VCT/6A
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95
x 100 x 116 |
3,9 |
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113.450 |
137.25 |
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373BX |
187 |
350V-0-50-350V/201mA,
5VCT/3A, 6,3VCT/5A
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95
x 100 x 116 |
3,8 |
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97.52 |
118.00 |
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374BX |
200 |
375V-0-50-375V/201mA,
5VCT/3A, 6,3VCT/6A
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95
x 100 x 116 |
3,9 |
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98.95 |
119.75 |
Hammond
"Classic" 300 series, power transformers
The 370HX is the power transformer for a 2A3 SE (mono/stereo)
or a 2A3 PP (mono) amplifier. Problem is that there
are no (extra) filament winding(s) for the directly
heated output tubes. This problem is easily solved by
using one of the small Hammond
266 transformers. A 2A3 SE can be made quiet enough
with AC tension on the filament. When you build a mono
bloc 2A3 SE use a Hammond 266M2. When you build a stereo
2A3 SE (or a mono 2A3 PP) use the Hammond 266M5. The
266M5 has 2 windings of 2,5V/3A each.
The
374BX is the standard power transformer for a 300B SE
(mono/stereo) or a 300B PP (mono) amplifier. To solve
the problem of the missing filament windings use a Hammond
266M12. With a 300B it is almost always necessary to
use a 5V DC filament power supply.
A 6,3VAC winding, bridge rectifier, capacitor of 10.000uF
and a small low value resistor to tune the tension to
exactly 5 VDC is the cheapest solution.
For best sound quality use the 6,3V AC winding into
Tentlabs
DHT Filament module.
Key Features:
• Primary: Universal - 100, 110, 120, 200, 220,
240 VAC 50/60 Hz.
• Units are designed to operate with BOTH primary
windings engaged.
• Bias Tap: 50 VAC tap from high voltage secondary
C.T.
• Highpot tested: 2,000 VAC
• Faraday Copper Primary Shield: Our electrostatic
shield reduces the capacitive coupling from the
primary - greatly attenuating higher frequency current
coupling to the secondaries (shield is internally grounded
to the end bell).
• Windings: Concentric wound for low stray field
and low noise.
• This series is an upgrade from the "200"
SERIES range of units
• 2 models designed specifically for 300B tubes
(300BX) and 2A3 tubes (302AX).
• Finish: Black powder paint to match our 1650
series of output transformers
• Units can be run full wave bridge or full wave
C.T.
• Conservative designs - CSA certified (209651).
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