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Products - Replacement Valve |
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| RV-14m [Specification] [Customer Feedback] |
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The RV-14m valve, is the ideal replacement for the "Obsolete" Telefunken VF14m, as used in the famous Neumann U47 / U48 microphones. |
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Being of the same physical size and appearance to the original Telefunken VF14m, the RV-14m is a direct "Plug-in" replacement. Provided that the microphone, lead and PSU combination, is in "Original" condition, then no electrical modifications are required - Please see "Guarantee" |
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Each valve is rigorously tested at various stages of production and carries it's own "Unique" serial number. |
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RV-14m, "Design and Construction" . |
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RV-14m Valve |
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| Price, RV-14m valve - £ 260.00 GBP | ||
| The above price includes delivery and insurance within the EU. (Delivery and Insurance "Outside" of the EU, at cost) | ||
| PLEASE NOTE | ||
| PLEASE NOTE - Each RV-14m is "Guaranteed for 1 year", from the date Invoiced. However, the use of any RV-14m in a modified microphone / PSU combination, that has not been electrically approved by SATURN SOUND Recording Services, will "Invalidate the Guarantee". | ||
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| "Non Standard" U47 / U48's etc. | ||
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In cases where electrical modifications have taken place, to the microphone e.g. a non-standard valve type is fitted etc, then a suitable "Retro" modification is available. Thus taking the microphone back to it's original "Neumann" design/circuit. |
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| Technical "Comparisons" between the RV-14m and VF14 valves | ||
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| Technical "Comparisons" between the RV-14m and VF14 valves | ||
| Test | RV-14m | VF14 |
| "Gain" @ 1kHz | +2.5 dB | 0 dB |
| "Self Noise", measured 30Hz-20kHz | -9 dB | 0 dB |
| "Lower" -2 dB point, ref' to 0dB @ 1kHz | 51 Hz | 42 Hz |
| "Upper" -2 dB point, ref' to 0dB @ 1kHz | 35 kHz | 37 kHz |
| Note | ||
| The above measurements were taken using a "Original" Neumann U47 body / pre-amp and NG type power supply. | ||
| The "Test" signal was applied via a 75pF capacitor, to simulate the capacitance of the KK47 capsule. | ||
| The VF14 used during the above testing, was the "Best One" out of a collection of 9 valves. Some being " NOS / As New" spares, the rest currently in use in my collection of U47 / U48 microphones. | ||
| Customer Feedback | ||
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| Customer Feedback | ||
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"Thanks firstly for such quick delivery of your RV-14m valve. It was a very simple swap for the VF14m currently in my U47. ..... you have done a remarkable job with this valve. It is slighter brighter than the VF14m and does not I feel lose out in having a tighter bottom end. It reminds me somewhat of the difference between the original M269 and M269C" Dermot Rooney |
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"..... the overall sound is the classic 47 ....." Sphere Studios, London |
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" It is really remarkable how closely it sounds to the VF-14. The only difference I could tell, was a SLIGHT extension on the top end, that sounds even better than it did before !!!! ..... the Microphone noise is lower as well " Mike Bridges, Germantown Studio, Nashville |
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" Initial thoughts are very positive. It sounded very similar, almost identical to my other U47 with a VF14 " Dennis Weinreich, Videosonics Cinema Sound, London |
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" We have previously purchased a RV-14m valve from you. It is absolutely fantastic ! " Marcus, Visual Sound, Sweden |
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" Just received your tube (RV-14m) and tried it, outstanding quality zero noise very good definition" Alex, Sounds Nice, Portugal |
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In response to the above comments |
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The extension in the HF and the tighter LF is due to the fact that the RV-14m valve is new. The VF14 being replaced could well be 50 years old or more, and therefore will be have mellowed somewhat through many years of use. The RV-14m will do likewise. These differences are much like the tonal qualities found in valve power amplifiers when new valves are fitted. |
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