Siemens - Klangfilm
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Output Transformers
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| My personal KLV and 6SELA power amp ranking | |||||||||
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Several people asked me to give recommendations which power amp they should use. So I made this page. This represents my personal opinion using speakers which really do not need high input power... Anyway, I hope this helps... |
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Original |
Sound quality using the amp in its unmodified (serviced) condition. | ||||||||
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Parts |
Stars for having (even) better parts - as MPs instead of electrolytics. The output transformers are neglected here. | ||||||||
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Circuit |
I like: Tube rectifiers, chokes in the power supply, moderate voltage designs, low feedback. I do not like: Too high B+, voltage doubling power supply designs, too much output power. |
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Final |
This is my (very personal) opinion about the sonical quality of the model after having carried out the mentioned modifications. |
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Collection |
Rare or hard to find model? Is it worth to collect this model for a special circuit design or other aspects or features? Nice looking? |
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| Model | Picture | Original | Parts | Circuit |
Modifications |
Final | Collection | ||
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**** | ***** | ***** |
Install an RCA jack input leading directly to the driver stage to omit the input stages. |
***** | ***** | ||
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KLV502 |
){kind=small} |
**** | ***** | ***** | Install an RCA jack input leading directly to the driver stage to omit the input stages. | ***** | **** | |
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){kind=small} |
**** | ***** | **** | Install an RCA jack input leading directly to the driver stage to omit the input stages. | ***** | ***** | ||
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){kind=small} |
*** | **** | **** | Install an RCA jack input leading directly to the driver stage to omit the input stages. | **** | **** | ||
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*** | **** | **** | Install an RCA jack input leading directly to the driver stage to omit the input stages. | **** | *** | ||
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2765 |
){kind=small} |
- | **** | *** | Output Transformer must be converted for low impedance speakers. Best for 16-32 Ohms. | **** | *** | |
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2805 |
){kind=small} |
- | **** | *** | Output Transformer must be converted for low impedance speakers. | *** | ** | |
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2798 (later) |
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- | **** | ** | Output Transformer must be converted for low impedance speakers. | *** | ** | |
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2796 |
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* 16-32 Ohm speakers |
*** | * | Output Transformer should be converted for low impedance speakers. | ** | **** | |
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2797 |
){kind=small} |
** | ***** | ** |
Use the "inner" winding on the OPT (see OPT section). 714102/65/1849 = 71916-J102D999 OPT recommended! |
** (***) |
** (***) |
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2803 |
){kind=small} |
** | ***** | ** |
Use the "inner" winding on the OPT (see OPT section). 714102/65/1849 = 71916-J102D999 OPT recommended! |
** (***) |
** (***) |
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2798 (early)98 |
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** | **** | ** |
Use the "inner" winding on the OPT (see OPT section). 714102/65/1849 = 71916-J102D999 OPT recommended! |
** (***) |
** |
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KLV503 2737 2730 |
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- | **** | ***** |
New output transformer needed. ***** final possible !!! Great base for DIY projects. |
( - ) | ** | |
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2735 2754 |
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- | **** | *** |
New output transformer needed. *** final possible !!! |
( - ) | ** | |
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To compare: |
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Leak |
ST20 | ** | ** | *** | Most TCC Metalmite caps are dead - the resistors drift ... | ** | ** | ||
| Heath | W5M | *** | *** | **** | Great OPT. Williamson circuit with too much feedback. Looks great! | **** | *** | ||
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Dynaco |
ST70 | *** | *** | *** | Nice OPTs. No real choke. 7199 = uncool tubes. | *** | ** | ||
| Marantz | 8b/8/5 | *** | *** | **** | Nice OPTs and bias meter. 6CG7 = uncool tubes. | **** | *** | ||
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Other comments: |
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- I have seen seen several KLV units (as V502) with blown power transformers. This is caused by connecting the units to 230V leads voltage (instead of 200V). I do not think the 6S ELA power transformers are really better. - for being a single ended amp the sound of the KLV 203 can not be really compared with the others - the Siemens Selenium rectifiers and also the electrolytic caps are of very nice quality (much better than Sprague or Mallory parts of the same age) - the Siemens & Halske S-H resistors are still unreached in the world of vintage parts... - the American / British amps got higher collection rates as I like their versability and the easy handling for their size and jacks |
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