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Contact Us By Email: sales@kgaenclosures.co.uk
Contact Us By Phone: 01535 636856
Please Note our NEW e-mail addresses: sales@kgaenclosures.co.uk or gary@kgaenclosures.co.uk

300 Series | High Voltage (Plate) and Filament - 39 VA to 940 VA
Universal Primary and 50/60 Hz. Operation.
Purchase Product Product Data Sheet Customisation Options

Product Features
  • Primary: Universal - 100, 110, 120, 200, 220, 230, 240 VAC 50/60 Hz.
    • Note: Units are designed to operate with both primary windings engaged.
    • See primary wiring information under resources.
  • Bias tap: 50 VAC tap from high voltage secondary CT (except part number 379WX - uses a separate 60 VAC 0.2 amp winding).
  • Hipot 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.
  • Models: This series is an upgrade from our entire 200 Series range of units PLUS 2 models designed specifically for 300B tubes (part number 300BX) and 2A3 (part number 302AX).
  • Finish: Black powder paint to match our 1650 Series of output transformers.
  • Units can be run full wave bridge or full wave CT.
  • Conservative designs - CSA certified (#209651).
  • For a more economical, open frame, universal primary - check out our 260 Series.
  • For that "high end" look and feel check out our potted versions - the 300P Series.
Hammond Manufacturing Transformers:
KGA Enclosures Ltd is a fully authorised distributor of the 300 Series from Hammond Manufacturing Transformers. We also stock the entire Hammond Manufacturing Transformers range at great competitive pricing and with full customisation options on all applicable products.

Please remember to always use approved distributors like KGA Enclosures Ltd as some companies sell knock-offs and copies, so using approved suppliers assures you receive a genuine product.

To purchase a product, request a quote/lead time and for all other general enquires, please use our contact form to contact us. We aim to respond promptly to all enquires. Payment options include Bank Transfer, PayPal and Credit/Debit cards. Unfortunately, we do not accept cash and cheques.
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300 Series | Hammond Manufacturing Transformers | KGA Enclosures Ltd
Product Options
For all ordering, price confirmation and lead times, please email us or call us on (+44) 01535 636856
Part No VA AC High Voltage Secondary RMS Bias Tap on High Voltage Secondary with CT Grounded (VAC) Filament No. 1 (VAC) Filament No. 2 (VAC) 1+ 5+
Horizontal Mount ("Z" Mounting)
369KZ 188 450 V CT at 300 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £149.85 £143.86
370DAZ 76 520 V CT at 104 mA. 50 6.3 V CT at 3.5 A - £91.99 £88.31
370KZ 218 500 V CT at 300 mA. 50 5 V at 6 A 6.3 V CT at 6 A £166.34 £159.68
373AZ 49 650 V CT at 46 mA. 50 5 V CT at 2 A 6.3 V CT at 2 A £101.19 £97.14
373CZ 159 650 V CT at 173 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £160.97 £154.53
373DZ 101 700 V CT at 104 mA. 50 5 V CT at 2 A 6.3 V CT at 3 A £131.09 £125.84
Vertical Mount ("X" Mounting)
300BX 280 800 V CT at 288 mA. 50 5 V CT at 1.2 A 5 V CT at 3 A £184.55 £177.17
302AX 198 600 V CT at 230 mA. 50 2.5 V CT at 2.5 A 5 V CT at 3 A £147.65 £141.74
363AX 32 200 V CT at 115 mA. 50 5 V CT at 2 A - £73.59 £70.65
363CX 119 360 V CT at 288 mA. 50 5 V CT at 3 A - £110.73 £106.30
369AX 40 250 V CT at 115 mA. 50 6.3 V CT at 2 A - £73.82 £70.87
369BX 39 300 V CT at 86 mA. 50 6.3 V CT at 2 A - £73.82 £70.87
369EX 45 380 V CT at 75 mA. 50 6.3 V CT at 2.5 A - £70.13 £67.33
369GX 50 450 V CT at 75 mA. 50 6.3 V CT at 2.5 A - £73.82 £70.87
369HX 120 450 V CT at 150 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £121.39 £116.54
369JX 50 500 V CT at 69 mA. 50 6.3 V CT at 2.5 A - £75.64 £72.61
369KX 188 450 V CT at 300 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £133.20 £127.87
370AX 44 480 V CT at 58 mA. 50 6.3 V CT at 2.5 A - £79.35 £76.18
370BX 55 550 V CT at 58 mA. 50 5 V CT at 2 A 6.3 V CT at 2 A £83.04 £79.72
370CAX 66 500 V CT at 81 mA. 50 5 V CT at 2 A 6.3 V CT at 2.5 A £93.14 £89.42
370CX 59 550 V CT at 75 mA. 50 6.3 V CT at 0.6 A 6.3 V CT at 2.5 A £89.68 £86.09
370DAX 76 520 V CT at 104 mA. 50 6.3 V CT at 3.5 A - £89.68 £86.09
370DX 86 550 V CT at 104 mA. 50 5 V CT at 2 A 6.3 V CT at 3 A £93.14 £89.42
370EX 119 550 V CT at 144 mA. 50 5 V CT at 3 A 6.3 V CT at 4 A £102.35 £98.26
370FX 141 550 V CT at 173 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £110.73 £106.30
370HX 180 550 V CT at 230 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £140.25 £134.64
370JX 133 500 V CT at 161 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £137.32 £131.83
370KX 229 500 V CT at 322 mA. 50 5 V CT at 6 A 6.3 V CT at 6 A £142.60 £136.89
370LX 340 550 V CT at 460 mA. 50 5 V CT at 6 A 6.3 V CT at 9 A £186.69 £179.22
370MX 403 550 V CT at 575 mA. 50 5 V CT at 6 A 6.3 V CT at 9 A £189.73 £182.14
370X 41 480 V CT at 46 mA. 50 5 V CT at 2 A 6.3 V CT at 1.5 A £81.63 £78.36
371X 63 560 V CT at 69 mA. 50 5 V CT at 2 A 6.3 V CT at 2 A £85.07 £81.67
372BX 98 600 V CT at 115 mA. 50 5 V CT at 2 A 6.3 V CT at 3 A £97.78 £93.87
372DX 127 600 V CT at 144 mA. 50 5 V CT at 3 A 6.3 V CT at 4 A £108.07 £103.75
372FX 150 600 V CT at 173 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £125.47 £120.45
372HX 191 600 V CT at 230 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £142.57 £136.87
372JX 243 600 V CT at 288 mA. 50 5 V CT at 4 A 6.3 V CT at 8 A £151.32 £145.27
372KX 432 600 V CT at 575 mA. 50 5 V CT at 6 A 6.3 V CT at 9 A £207.02 £198.74
372LX 520 600 V CT at 690 mA. 50 5 V CT at 6 A 6.3 V CT at 12 A £230.14 £220.93
372X 75 620 V CT at 81 mA. 50 5 V CT at 2 A 6.3 V CT at 2.4 A £96.58 £92.71
373BX 187 700 V CT at 201 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £129.18 £124.01
373DX 101 700 V CT at 104 mA. 50 5 V CT at 2 A 6.3 V CT at 3 A £128.78 £123.63
373EX 311 650 V CT at 345 mA. 50 5 V CT at 6 A 6.3 V CT at 9 A £194.21 £186.44
373FX 386 650 V CT at 460 mA. 50 5 V CT at 6 A 6.3 V CT at 9 A £201.93 £193.86
373HX 369 700 V CT at 403 mA. 50 5 V CT at 6 A 6.3 V CT at 9 A £216.87 £208.19
373JX 710 700 V CT at 863 mA. 50 5 V CT at 6 A 6.3 V CT at 12 A £391.34 £375.69
373X 125 700 V CT at 127 mA. 50 5 V CT at 2 A 6.3 V CT at 4 A £120.84 £116.01
374AX 136 720 V CT at 138 mA. 50 5 V CT at 3 A 6.3 V CT at 3.5 A £119.58 £114.80
374BX 200 750 V CT at 201 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £138.41 £132.88
374X 141 750 V CT at 127 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £110.40 £105.98
375X 171 800 V CT at 155 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £197.76 £189.85
376X 157 640 V CT at 173 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £151.76 £145.69
378CX 465 800 V CT at 534 mA. 50 6.3 V CT at 6 A - £188.25 £180.72
378X 237 800 V CT at 230 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £175.33 £168.32
379WX 940 800 V CT at 1.06 A or 850 V CT at 1 A 60 6.3 V CT at12 A - £420.89 £404.06
379X 193 850 V CT at 173 mA. 50 5 V CT at 3 A 6.3 V CT at 5 A £160.97 £154.53
382X 283 1,000 V CT at 230 mA. 50 5 V CT at 3 A 6.3 V CT at 6 A £193.16 £185.43
384X 329 1,200 V CT at 230m A 50 5 V at 3 A 6.3 V at 3 A £206.69 £198.43
For product compatibility and more information, please click part number or view our product data sheet.

300 Series | Power - Classic High Voltage Tube Plate | Hammond Manufacturing Transformers | KGA Enclosures Ltd

Hammond Manufacturing Customisation Services
Product Customisation Options:
What makes KGA Enclosures Ltd different from most other larger distributors is that we can offer full customisation services on all enclosures and accessories. All customisation work is undertaken by the relevant supplier, (some smaller production runs are done by utilizing an outside contractor) at their own manufacturing facilities. These services include milling or punching holes and slots into the enclosure or end plates for cables, connectors, switches, etc. Printing and silk-screening services all for the addition of text, logos, and graphics onto both the enclosure and end plates, to allow the end user to easily identify the product, and to allow the final product to look more elegant. Contact us today to see how we can assist you.
Modified Electronic Enclosures:
Almost every enclosure will need some kind of modification to be useful. In house, modifications can be tedious, over-complicated, and a distraction from your core business. A third party shop can add time and expense. Let us help you by delivering quality products made to your exact specifications.
Why Use Hammond Manufacturing?
  • Hammond offers a wide selection and massive inventory ready to be modified.
  • Typically, the minimum order is 25 units. This can vary depending on the product and services required.
  • Hammond has an experience enclosure modification team and two dedicated modification facilities located in North America and Europe. We are knowledgeable, available, and capable.
  • Hammond helps eliminate scrap and design errors with approval drawings to confirm correct interpretation of your design requirements. Many orders will also include fast delivery of sample enclosures for inspection. These steps ensure that your assembly fits perfectly before heading to the production stage.
Popular Modification Services Offered:
  • Holes.
  • Cutouts.
  • Tapping and Countersinking.
  • Pressed-in hardware (studs, standoffs).
  • Silk Screening.
  • UV Printing.
  • Special colours.
  • Special length extrusions.
  • Pre-Installed Accessories.
  • Available services vary by product.
Customisation Serices | Hammond Manufacturing | KGA Enclosures Ltd

300 Series | Hammond Manufacturing Transformers | Enclosures - Racks - Transformers - Components


Contact KGA Enclosures
Call Us: (+44) 01535 636856
E-Mail - Sales: sales@kgaenclosures.co.uk
E-Mail - Gary (MD): gary@kgaenclosures.co.uk
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Postal Address
44 Egroms Lane
Withernsea
East Riding of Yorkshire
HU19 2LZ (UK)
VAT No. GB 204612745
KGA Enclosures Ltd (2026)
Business No. 09341700