TRANSFORMERS FOR TUBE PREAMPLIFIERS

(INTERSTAGE)

NOTE:

This page will be updated soon


Attention! There is a high voltage!
Observe safety arrangements by operation with a high voltage!


In all interstage transformers sectioning is applied for reaching of as much as possible wide pass-band.
Each transformer passes primary heat treatment in a current of 24 hours in thermocases and vacuum impregnation by a varnish in primary sort.
For a bandage couplers from not magnetic materials are used.
Standard multi-coloured outputs of transformers (length 15 - 20 cm)
can be used directly in point-to-point application.
Differ in pairs of transformers no more than 5 % on all measured parametres.
We offer interstage transformers potted into black boxes of black colour (powder colouring) or not potted.
Manufacturing of interstage transformers under the individual technical specification is possible.

"Golden Middle" reserves the right to make product changes without affecting the technical specifications.

All transformers have a limited warranty according technical specifications
during 12 months from the date of receiving.



POT - IS - 5 / 5
Ra /RÝ 5 KOhm / 5 KOhm 1 : 1

potted into black boxes

interstage transformers for tube amplifiers

TECHNICAL SPECIFICATIONS :

Case dimensions : 75 mm x 85 mm x H 95 mm
The adjusting sizes : 4 § M3 55 mm § 65 mm
Inductance : 25 H ( max DCI = 60 mA )
The maximum DC operation voltage : 1000 V
Frequency range of 10 V : 10 Hz - 30 KHz

It is recommended to use with following vacuum tubes :
4P1L, 6F6S / 6F6 (in triode), 6S4S / 2S4S / 2A3,
300B, 6P3S / 6L6 (in triode), EL86, 6P14P / EL84 / 6BQ5,
6S9P, 6P14P / EL84 / 6BQ5 (in triode)

Transformer circuit diagram Transformer circuit diagram



POT - ISHP - 3 / 300              OT - ISHP - 3 / 300
3 KOhm / 300 Ohm

potted into black boxes         not potted

interstage transformers for tube amplifiers        interstage transformers for tube amplifiers

TECHNICAL SPECIFICATIONS :

Case dimensions : 75 mm x 85 mmm x H 95 mm (for the potted item)
The adjusting sizes : 4 § M3 55 mm § 65 mm (for the potted item)
Inductance : 25 H ( max DCI = 80 mA )
The maximum DC operation voltage : 1000 V
Maximum primary AC voltage : 200 V (50 Hz)
Frequency range of 10 V : 10 Hz - 30 KHz

It is recommended to use with following vacuum tubes :
4P1L, 6F6S / 6F6, 6P14P / EL84 / 6BQ5 (in triode),
6S19P, 6P3S / 6L6 (in triode)

Transformer circuit diagram Transformer circuit diagram



POT - ISPP - 3 / 3 / 3
3 KOhm / 2 x 3 KOhm
(3 KOhm : 3 KOhm : 3 KOhm without DC current)

potted into black boxes

interstage transformers for tube amplifiers

TECHNICAL SPECIFICATIONS :

Toroidal core
Case dimensions : 90 mm x 90 mm x H 60 m
The adjusting sizes : 4 § M3 75 mm § 75 mm
Inductance : 20 H
The maximum DC operation voltage : 500 V
Maximum primary AC voltage : 200 V (50 Hz)
Frequency range of 10 V : 15 Hz - 25 KHz

It is recommended to use with following vacuum tubes :
6S15P, 6S45P-E, 6N6P, 6S19P, 6S4S / 2S4S / 2A3

Transformer circuit diagram Transformer circuit diagram



POT - HP - 2,5 / 30
2,5 KOhm / 30 Ohm

potted into black boxes

interstage transformers for tube amplifiers

TECHNICAL SPECIFICATIONS :

Case dimensions : 60 mm x 65 mm x H 65 mm
The adjusting sizes : 4 § M3 45 mm § 50 mm
Inductance : 10 H ( max DCI = 55 mA )
The maximum DC operation voltage : 500 V
Maximum primary AC voltage : 60 V (50 Hz)
Frequency range of 10 V : 25 Hz - 30 KHz

It is recommended to use with following vacuum tubes :
EL86, 6P15P (in triode), 6S15P, 6S45P-E, 6S19P

Transformer circuit diagram Transformer circuit diagram



POT - PPHP - 3,0 / 30
Ra-a 3 KOhm / Rh 30 Ohm
(without DC current)

potted into black boxes

interstage transformers for tube amplifiers

TECHNICAL SPECIFICATIONS :

Toroidal core
Case dimensions : 90 mm x 90 mm x H 60 mm
The adjusting sizes : 4 § M3 75 mm § 75 mm
Inductance : 23 H
The maximum DC operation voltage : 500 V
Maximum primary AC voltage plate - to - plate: 200 B (50 Hz)
Frequency range of 10 V : 15 Hz - 22 KHz

It is recommended to use with following vacuum tubes :
2 x 6S15P, 2 x 6S45P-E, 2 x 6N6P, 2 x 6S19P, 2 x 6═30¤, 2 x 4P1L (in triode)

Transformer circuit diagram Transformer circuit diagram



POT - PRE - 5 / 30 / 300 / 600 / 3000              PT - PRE - 5 / 30 / 300 / 600 / 3000
Ra 5 KOhm / RÝ 30 - 3000 Ohm for preamplifier for head-phones
4 variants of primary commutation are possible

potted into black boxes         not potted

interstage transformers for tube amplifiers         interstage transformers for tube amplifiers

TECHNICAL SPECIFICATIONS :

Case dimensions : 60 mm x 65 mm x H 90 mm (for the potted item)
The adjusting sizes : 4 § M3 40 mm § 45 mm (for the potted item)
Dimensions : 55 mm x 55 mm x H 90 mm (for the not potted item)
Inductance : 20 H ( max DCI = 55 mA )
The maximum DC operation voltage : 1000 V
Maximum primary AC voltage plate - to - plate: 150 B (50 Hz)
Frequency range of 10 V : 15 Hz - 45 KHz

It is recommended to use with following vacuum tubes :
6S15P, EL86, 4P1L, 6S45P-E, 2 x 6N6P,
6N30P-DR, 2 x 6P15P (in triode)

Transformer circuit diagram Transformer circuit diagram



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