File:TEISCO 74R guitar amp (1960s, black-on-red cover) - New tubes (2006-12-14 20.46.00 by Ian Abbott).jpg
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[edit]DescriptionTEISCO 74R guitar amp (1960s, black-on-red cover) - New tubes (2006-12-14 20.46.00 by Ian Abbott).jpg |
Some of the original tubes were in good condition, but substitution showed that four of the 6AU6 pentodes in the pre-amp section were weak and/or noisy. I replaced them with 1980s vintage US military tubes that sound good. It's interesting to note that this amplifier does not use any of the 12-series twin triodes that were (and still are) so popular with amplifier designers. All of the small-signal tubes are pentodes. The Japanese "NEC" brand 6V6GT output tubes were in good condition, so there was no need to replace them. tremolo 6V6GT valve amp tube amp vacuum tube amp tube guitar amp vacuum tube guitar amp amp amplifier guitar amp guitar amplifier Teisco Del Rey Teisco Teisco amp Teisco guitar amp Teisco guitar amplifier . |
Date | |
Source | New tubes |
Author | Ian Abbott from Santa Clara, California, USA |
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This image was originally posted to Flickr by Ian E. Abbott at https://www.flickr.com/photos/103579181@N02/13493943124. It was reviewed on 19 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
19 May 2015
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current | 03:15, 19 May 2015 | 3,008 × 2,000 (2.32 MB) | Clusternote (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5 |
Date and time of data generation | 20:46, 14 December 2006 |
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Orientation | Normal |
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File change date and time | 20:46, 14 December 2006 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 20:46, 14 December 2006 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 4.6 APEX (f/4.92) |
Metering mode | Center weighted average |
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DateTime subseconds | 90 |
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DateTimeDigitized subseconds | 90 |
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