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The history of the Hammond family goes back to 1917 in Canada.

For those interested the link : www.hammondmfg.com/hist.htm will be very enlightening.

picture of 1939 catalogue, copyright Hammond MFG

In the process of time the Hammonds have evolved into a well-established manufacturing company quite famous for almost all kinds of transformers. At the moment Hammond MFG has become quite popular among audio enthousiasts especially those who favour tube amplification. Hammond MFG of Canada provides an endless variety of products for audio applications : Power/ Interstage/ Output transformers, Choke series, Alum Chassis series.

The company's know-how, as well as the products, is practically unlimited :

power transformers : board mount, vertical, low-profile, epoxy cast, low-voltage/filament, chassis mount, high-current, toroidal

chokes and reactors : DC, low to high current, miniature, RF, EMI/RFI

audio transformers : board mount, potted, epoxy-potted, open-type, chassis mount, shielded, single-ended, push-pull, sound distribution, speaker matching, voice

energy limiting transformers : box mount, plug in

pulse transformers : board and chassis mount

line transformers : isolating, autotransformers, hard wired, plug in

Hammond Manufacturing Group produces output and interstage transformers for valve amplifiers since the '30s. Regardless of what the amplification topology might be, a Single Ended (SE) or an ambitious Push-Pull (PP) circuitry, Hammond provides the right transformer.

The last 75 years the company features a constant process of evolution and improvement, a fact which has been intensified the last years due to the increased popularity of valve audio amplification.

Let's have a close look on their point of view :

 

extract from the year 2000 catalog, copyright Hammond MFG

It is also true that a lot of discussion has been raised lately in the audiophile web fora on the Hammond product family and their technical 'secrets'. Another extract from the same source is quite interesting :

 

extract from the year 2000 catalog, copyright Hammond MFG

 

Apart from the OEM production of transformers for the audio industry, Hammond MFG provides four (4) series of output transformer products for the DIYers, following contemporary circuit design trends :

For Single Ended (SE) topologies :

1627 to 1642 series ( details )

universal 125SE ( details )

For Push-Pull (PP) topologies :

1608 to 1650 series ( details )

universal 125 ( details )

In addition a variety of chokes and power supply transformers are also available (MTZ Audio maintains a stock of a limited number of types of p.s.transformers and chokes but welcomes the order of any type, even at a small quantity) :

power supply series ( details )

choke series ( details  )

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SE  16xx Transformer Series

Single Ended Ultra-Linear Tube Output

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

Overdesigned construction for SE triode, tetrode or pentode tube output circuits.
Minimum frequency response 20 Hz to 20 KHz at FULL RATED power (+/- 1 dB max. / ref. 1 KHz) !
Insulated flexible leads 20cm min.
All units except for the 1642SE, include a 40% screen tap for Ultra-Linear operation.
High quality M6 grain oriented silicon steel laminations.

 

Table of Product Specs

Table of Product Dimensions

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	E	G(slot)
	1627SE	3.75	5	4.56	3	3.81	.203x.38
	1628SE	3.75	5	4.56	3	3.81	.203x.38
	1629SE	3.75	5	4.56	3	3.81	.203x.38
	1640SE	3.75	5	4.56	3	3.81	.203x.38
	1642SE	4.38	7.5	5.25	3.5	5.88	.203x.38

 

Pin-out Diagram (except for 1642SE)

 

Secondary Winding Connection Diagrams

(except for 1642SE)

for 1642SE diagrams and connection instructions consult Hammond MFG website or call us!

 

Table of Suggested Tube Types

for more information on suggested tube types consult HAMMOND MFG website or call us!

SE  Universal 125SE Transformer Series

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

Designed for general purpose or replacement use (not HiFi) in SE tube output circuits.
Frequency response 100 Hz to 15 KHz at FULL RATED power (+/- 1 dB max. / ref. 1 KHz) !
30cm primary and secondary leads.
Primary Impedance range : 2.5K to 10K Ohms.
Butt stacked cores (29M6 steel) with an air gap to reduce DC core saturation.

 

Table of Product Specs

Table of Product Dimensions (125ASE to 125ESE)

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	G(hole)
	125ASE	2.81	1.35	1.69	2.38	0.187
	125BSE	3.25	1.63	2.00	2.81	0.187
	125CSE	3.69	1.86	2.31	3.13	0.187
	125DSE	4.00	2.10	2.63	3.56	0.187
	125ESE	4.50	2.36	2.94	4.00	0.187

Table of Product Dimensions (125FSE,125GSE)

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	E	G(hole)
	125FSE	3.76	2.52	3.15	3.13	2.25	.2 x .38
	125GSE	4.15	2.88	3.46	3.45	2.50	.2 x .38

 

 

Pin-out Diagram

for connection instructions consult Hammond MFG website or call us!

PP  16xx Transformer Series

Push-Pull Ultra-Linear Tube Output

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

Designed for Push-Pull (PP) tube output circuits.
Minimum frequency response (except for 1650E) 30 Hz to 30 KHz at FULL RATED power (+/- 1 dB max. / ref. 1 KHz) !

For the 1650E minimum frequency response 70 Hz to 30 KHz at FULL RATED power (+/- 1 dB max. / ref. 1 KHz) !

Insulated flexible leads 20cm min.
All units except for the 1650G, include a 40% screen tap for Ultra-Linear operation.
Typical applications include PP : triode, Ultra-Linear pentode, pentode and tetrode connected audio output. The 1650G does NOT have primary screen tap and does NOT support "Ultra Linear" operation.

Table of Product Specs

Table of Suggested Tube Types

for more information on suggested tube types consult HAMMOND MFG website or call us!

 

Table of Product Dimensions

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	E (+/-1/16'')	G(slot)
	1608	2.50	2.75	3.06	2.00	1.69	.203x.38
	1609	2.50	2.75	3.06	2.00	1.69	.203x.38
	1615	2.50	3.25	3.06	2.00	2.19	.203x.38
	1650E	2.50	3.25	3.06	2.00	2.50	.203x.38
	1620	2.50	3.50	3.06	2.00	2.44	.203x.38
	1650F	2.50	3.50	3.06	2.00	2.44	.203x.38
	1645	2.50	3.75	3.06	2.00	2.69	.203x.38
	1650G	3.13	3.75	3.81	2.50	2.25	.203x.38
	1650H	3.13	4.00	3.81	2.50	2.69	.203x.38
	1650K	3.13	4.00	3.81	2.50	2.69	.203x.38
	1650N	3.13	4.25	3.81	2.50	2.94	.203x.38
	1650P	3.13	4.25	3.81	2.50	2.94	.203x.38
	1650R	3.75	4.25	4.56	3.00	3.06	.203x.38
	1650T	3.75	4.50	4.56	3.00	3.31	.203x.38
	1650W	4.38	7.50	5.25	3.50	5.88	.203x.38

 

Pin-out Diagram (except for 1650E, 1645 & 1650G)

 

Secondary Winding Connection Diagrams

(except for 1650E, 1645 & 1650G)

 

Pin-out Diagram for 1650E

for 1650E connection instructions consult Hammond MFG website or call us!

 

Pin-out Diagram for 1650G

for 1650G connection instructions consult Hammond MFG website or call us!

 

Pin-out Diagram for 1645

for 1645 connection instructions consult Hammond MFG website or call us!

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PP  Universal 125 Transformer Series

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

 

Designed for general purpose or replacement use in PP tube output circuits.

Frequency response 150 Hz to 15 KHz (+/- 1 dB max. / ref. 1 KHz) !

Minimum 12.7cm long, primary winding leads and secondary winding solder lugs.

Primary Impedance range : 1.2K to 25K Ohms.

Secondary Impedance range : 1.5 to 15 Ohms.

 

Table of Product Specs

Table of Product Dimensions

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	G(hole)
	125A	2.06	1.25	1.19	1.75	0.187
	125B	2.38	1.38	1.38	2.00	0.187
	125C	2.81	1.50	1.69	2.38	0.187
	125D	3.25	1.75	2.00	2.81	0.187
	125E	3.69	2.00	2.31	3.13	0.187

 

Pin-out Diagram

for connection instructions consult Hammond MFG website or call us!

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Power Transformer Series

"Classic" Plate and Filament Supply

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

Equipped with a universal primary for 100,110,120,200,220,240 VAC (50/60Hz) mains supply.

Concentric wound windings for low stray field and reduced noise.

Bias tap 50 VAC from high voltage C.T.

Four-hole chassis mount.

Minimum 15cm long leads.

Class A insulation (up to 105 degrees ^oC) !

Extra handling safety guaranteed  by Hi-Pot test of 2kV RMS !

Conservative design -CSA certified #LR3902

Table of Product Specs (MTZ audio stock part numbers only)

Table of Product Dimensions (MTZ audio stock part numbers only)

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	E	G(hole)
	369JX	2.50	2.75	3.06	2.00	1.69	.203x.38
	372JX	3.75	4.50	4.56	3.00	3.34	.203x.38

Primary Winding Connection Diagram

100, 110 and 120 VAC mains connection diagram

200, 220 and 240 VAC mains connection diagram

for connection instructions consult Hammond MFG website or call us!

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Choke Series

Open Bracket 15x Series

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

 

15% inductance and resistance tolerance.

Inductance measured at rated DC current !

Minimum 12.7cm long leads.

Less inductance at slightly higher currents or more at lower current values.

 

 

Table of Product Specs (MTZ audio stock part numbers only)

part number	Inductance	DC current	Resistance in Ohms	Max Operating Voltage DC
155C	60H	8mA	2750	400V
156B	1.5mH	5A	0.07	400V

 

Table of Product Dimensions (MTZ audio stock part numbers only)

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	G(hole)
	155C	2.38	1.38	1.38	2.00	0.187
	156B	2.81	1.50	1.69	2.38	0.187

for application guidelines consult Hammond MFG website or call us!

 

---

Choke Series

Enclosed 19x Series

(product information and pictures drawn from www.hammondmfg.com, copyright HAMMOND MFG)

 

15% inductance and resistance tolerance.

Inductance measured at rated DC current !

Minimum 20cm long leads.

Less inductance at slightly higher currents or more at lower current values.

Perfect for high voltage power supply filtering.

 

 

Table of Product Specs (MTZ audio stock part numbers only)

part number	Inductance	DC current	Resistance in Ohms	Max Operating Voltage DC
193C	20H	100mA	181	600V
193H	5H	200mA	65	600V
193N	3H	500mA	35	600V

 

Table of Product Dimensions (MTZ audio stock part numbers only)

	p/n	Dimensions in inches ('') (1''=25.4mm)
		A	B	C	D	E	G(hole)
	193C	2.50	3.25	3.06	2.00	2.19	.203x.38
	193H	2.50	2.75	3.06	2.00	1.69	.203x.38
	193N	3.13	3.75	3.81	2.50	2.44	.203x.38

for application guidelines consult Hammond MFG website or call us!

 

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www.hammondmfg.com

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