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Old 2nd Nov 2021, 7:52 pm   #4
DMcMahon's Avatar
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 4,982
Default Re: Grundig TK27 - Low audio output

My experience with some of the Grundig valve TKs is that the main +HT DC voltage can sometimes be substantially lower than the stated value on the schematic and the unit can still work normally, also the valve electrodes voltages can still be relatively close to the values shown on the schematic.

So what I am hinting at is that your low HT voltage may not necessarily be the root cause of the low playback volume. Would suggest you measure the various valve electrode voltages to see if any are substantially different to the schematic values and check the components around suspect voltage areas.

Apart from the low volume is the sound quality otherwise OK ?

Is the volume low both on new and old recordings ?

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