(Video) *Free Worldwide Shipping* Vintage STC Standard Telephones and Cables / Coles Electroacoustics Mic | London, England model 4033-A microphone, 1940-1965 | Dual Element Cardioid Ribbon Microphone 4033 A | XLR Adapter Included | Interesting Provenance


Riffers (UK) is proud to advertise for sale one of the best FOK / drum room microphones around… the STC 4033-A.

STC (Standard Telephones and Cables) model 4033-A microphone, 1940-1965.

This cardioid composite microphone was produced for the television age. A more directional microphone was required, that would pick up the sound of the action in front of the camera, without the sound of the camera mechanism behind. The area around a microphone from which it can pick up sound is called the polar pattern. By combining the moving coil from the STC 4035 microphone with a ribbon, a cardioid, or heart-shaped, polar pattern can be achieved, which picks up lots of sound from in front, but little from behind the microphone. Thus, the 4033-A was born. This microphone was frequently used as a boom mic for TV production, as well as for outside radio broadcasts, where it was useful for cutting out unwanted background sounds. It has the added advantage of being able to switch between the ribbon and moving coil, or both, to give different polar patterns in different circumstances.

Measurements: overall: 117 mm x 271 mm x 134 mm, 3 kg

Source: Science Museum Group. STC 4033-A Microphone. 2012-5118/427Science Museum Group Collection Online. Accessed July 9, 2023.


This is one of two microphones we have that come from the popular F & F Palais de Danse, 201 Dumbarton Rd, a once popular venue in Glasgow. The site was occupied by Star Palace cinema, 1910-1925, then it was acquired by entertainment entrepreneurs Fyfe & Fyfe, who converting it into a roller skating rink-cum-dance hall. It was the F & F Palais de Danse on three nights a week, with another three nights reserved for roller skating. Dancing continued until the 1960s, when it was converted into a bingo hall.

Source: Glasgow City Archives (Archives ref: D-CA 8/988)


Fully functioning: see demo video where we test and run through the three settings of this versatile microphone. Some scratches commensurate with its age but otherwise very good cosmetic condition. No knocks or dents.

Also included:

  • 4033-A to XLR adapter (not photographed)
  • Worldwide Postage

Further Information:

The Stantel Cardioid is a composite microphone with the outstanding feature of an almost perfect heart-shaped (Cardioid) polar response over a wide range of frequencies in both its horizontal and vertical planes. It is composed of a moving coil and a ribbon type microphone either of which may also be used independently, thereby affording three distinct types of microphone in one.

The significance of a heart-shaped characteristic is that the response is substantially uniform over a solid angle of about 120° at the front of the microphone, while outside this area and in the rear, the microphone is comparatively dead. It is, therefore, pre-eminently suitable for all applications where sound from one direction is required to the exclusion of sound from another.

This one-sided pick-up characteristic of the cardioid microphone makes it invaluable for use in theatres and where audience noises are to be eliminated. Similarly, in television studios, noises off the set can effectively be cut out, whilst the frequency range of the microphone fully accords with the wide band transmission channels available for television sound.

This same uni-directional property of the cardioid microphone makes it equally suitable for suspending above a group of artistes. It will then provide uniform pick-up from each member of the group while remaining comparatively insensitive to reflected sounds from the walls and ceiling even under acoustic conditions which would normally render a room unsuitable for use as a studio. Another practical aspect of cardioid response in reverberant auditoria, where sound reinforcement is limited by acoustic feedback, is that the degree of discrimination between direct and reflected sound permits a substantial increase in working level without risk of singing.

Yet another noteworthy feature of this multi-purpose microphone is its comparative immunity from shock effects. The more robust construction of the ribbon element, while sacrificing nothing in sensitivity, makes it most suitable for mounting on a boom or in other positions where it is liable to be exposed to slight air currents.


Many studio presentations demand a microphone with bidirectional pickup characteristics. A turn of the switch at the back of the microphone from the C or Cardioid position to the R or Ribbon-element-only position results in a figure of eight response with substantially dead areas on either side.

As a third application, the same microphone may also be used for announcing purposes by simply switching to the P or Pressure-unit-only position. It will then function as a simple moving-coil micro-phone whose response is similar to that of the 4035 type or the 4021 type with an acoustic baffle. This type has the merit that, unlike that of the ribbon type microphone, bass notes are not accentuated when the microphone is used for close talking. Response in the P position is non-directional up to a frequency of 2000 c/s but becomes directional at higher frequencies.


The cardioid shape of the polar response of this microphone is obtained by the combination of a ribbon element with a moving-coil unit. Theoretically, if the moving-coil element were sufficiently small to produce negligible diffraction effects in the frequency range, and were mounted clear of other reflecting objects, the combination of this type with a ribbon microphone which has a response proportional to the cosine of the angle of incidence, would produce a pure cardioid polar response curve. Practical mechanical considerations prevent the moving-coil element from being an omni-directional transducer. The construction, therefore, has to be a compromise, and the response, as in all other microphones of this type, is accomplished by combining the outputs of the two components in a suitable electrical network. The schematic drawing shows an inductance Ly, which in association with the capacitance C progressively attenuates the contribution of the ribbon element to the combined output. The effect of this at the higher frequencies is to confine the output of the combination to that of the moving-coil element alone. The operation of the three-position switch at the rear of the case can be seen from the schematic. In position C (Cardioid) both elements are connected, their outputs being in series. In the position P (Pressure) the ribbon element is short-circuited, and in the position R (Ribbon) the moving-coil element is short-circuited.


Output Impedance:

50 ohms approximately, at 1000 c/s

Mean Open-circuit Response:

As cardioid combination -80db*

As ribbon or dynamic only -85db*


Overall height 9 in × 3 in x 3½ in (288 × 77 x 89 mm)

Weight: –3 lb (1360 grammes)

Connections:- To fit 4069-A jack**

* 0 db equals 1 volt/dyne/cm2

** Suitable microphone stands are available in which this jack is embodied in the upper part of the stand.

Source: STC 4033-A Owner’s Manual

Shipping / Collection / Import Duty (etc):

  • Postage within the UK is always included in the purchase price (unless otherwise stated in the ad).
  • We offer international shipping options for our customers and it is calculated automatically at checkout.
  • To ensure the safe delivery of your purchase, our gear is meticulously packed with acid-free paper, bubble wrap, parcelling chips, and sturdy double-walled boxes, protecting it from the shocks and knocks that shipments may encounter.
  • If desired, we can ship your purchase fully insured against damage and loss (please enquire for a quote).
  • Any additional charges, such as import duties, that may apply to your shipping address are the sole responsibility of the buyer.
  • For local buyers, we warmly welcome and encourage pickup, especially for high-end and fragile items.
  • We offer the option of in-person delivery for high-end items of value. This service is particularly beneficial for overseas buyers and is frequently utilised by our customers in France and Germany. For further information and details, please don’t hesitate to get in touch with us.
  • If you suspect that the postage cost calculated at checkout is inaccurate, feel free to request a shipping quote for clarification, as shipping quotes may vary.

Returns Policy:

Your satisfaction is important to us. If you are not completely satisfied with your purchase, you have the option to return it to us within 14 days for a refund. Please note the following terms:

  • Original Postage Deduction: The original postage cost will be deducted from the refund amount (this also applies to UK customers).
  • Restocking Fee: A 5% restocking fee will be applied to the refund.
  • Return Expenses: Any expenses related to return postage and customs duty are not covered and remain the responsibility of the buyer.

If you have any questions or need assistance with a return, please feel free to contact us.

Reserving Items:

To accommodate your needs, we gladly offer item reservations for a period of 30 days. To secure the reservation, a non-refundable deposit of 10% of the sale price is required. This deposit ensures that the item will be held exclusively for you during the reservation period. Should you decide to proceed with the purchase, the deposit will be applied towards the total amount. Please feel free to contact us for any inquiries or to arrange an item reservation.

Part-Exchanges and Trades:

We are open to considering part-exchange for high-end gear. However, it’s important to note that as a business, we aim to turn a profit, and therefore, the value offered for part-exchange may not match what you could potentially receive by selling your gear privately. Nonetheless, part-exchange can often provide opportunities that budget-conscious buyers might not otherwise have. If you are interested in exploring part-exchange options, please don’t hesitate to contact us for further details.

Gear Buy-Back:

We have a heartfelt attachment to the items we purchase and parting with any piece from our collection can be difficult. However, should you choose to sell any gear that was originally purchased from us at a later date, we will always be willing to consider buying it back (within reasonable terms). Feel free to reach out to us if you’re interested in exploring the buy-back option or have any questions about the process.


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(Video) *Free Worldwide Shipping* Vintage STC Standard Telephones and Cables / Coles Electroacoustics Mic | London, England model 4033-A microphone, 1940-1965 | Dual Element Cardioid Ribbon Microphone 4033 A | XLR Adapter Included | Interesting Provenance