The GZ34 isn’t a very talked about tube, but it is one of the most common rectifier tubes found in audio, especially in guitar amps. Rectifier tubes were some of. Page 1. Page 2. Page 3. Page 4. Page 5. GZ34 page sheet date. 1. 1. 2. 2. 3. 3. 4. 4. 5. FP. GZ Netzröhre für GW-Heizung indirekt geheizt. Parallelspeisung. DC-AC- Heating indirectly heated connected in parallel. TELEFUNKEN. Zweiweg-.
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Only when loaded to it’s full capacity does the AC transformer voltage fall to its advertised value. Under light loading the DC output voltage will again be equal to: Collection of Tomasz Szczesniak PL. Hybrid Bridge Rectifier Ordinary full-wave valve rectifiers cannot be set up as a bridge since they have a single shared cathode.
Notice that all the diodes ‘point’ towards the positive output. Valve rectifiers can’t handle the high current levels that silicon diodes can. In the hybrid bridge hybridge? Collection of Massimo Pedrina I.
GE 5AR4 Datasheet
Valve rectifiers sometimes also need current-limiting resistance to protect them see shortly from excessive ripple and surge currents. Collection of Peter Steffen CH. This causes a significant loss of voltage which increases with load current, leading to power supply voltage ‘sag’ during loud passages. The attached pdf gives a brief overview, but other factors such as series resistance and capacitor loading must also be considered. The best option is to buy diodes with higher voltage ratings, but they’re not nearly as common as the 1N However, something like a DC heater supply would probably need beefier diodes.
GZ34 Data from Mullard. Antique radios, Old Time Radios. Collection of Karl – Heinz Bossan D. Collection of Gz43 Schaufelberger CH. GZ34 End of forum contributions about this tube. Telefunken Werkstattbuch Wolfgang Bauer. Valve rectifier data sheets usually state the maximum RMS transformer voltage that the valve can withstand in an ordinary two-phase rectifier circuit, rather than quoting limits in peak values like modern data sheets. The vast majority of valve guitar amps still use two-phase rectifiers even when datasyeet use solid-state diodes.
Collection of Patrice Zeissloff F. A 1N is rated for V.
Therefore, we can’t use the 1N if the advertised transformer voltage is greater than Vrms. Don’t forget about adding fuses!
JJ Electronic – GZ34S – 5AR4
Collection of Pedro Prieto-Castro E. Collection of Massimo Pedrina I. The GZ34 data sheet quotes Vrms although personally I wouldn’t trust a modern production bottle to handle this. Superficially this looks like a bridge rectifier and you can indeed use a bridge rectifier diode packagebut it is best viewed as a pair datashret two-phase rectifiers.
What if the transformer voltage is higher than this? The data sheet will also quote the maximum average DC current that the valve can handle.
This should be no problem with modern silicon diodes. The story is different with a two-phase rectifier see later. You reach this tube or valve page from a search after clicking the “tubes” tab or by clicking a tube on a radio model page.
Collection of Reinhard Riek D.
The Valve Wizard
Collection of Alberto Ammendola I. However, on a low voltage supply for DC heaters, say the diode drop represents a significant loss and should be considered. These resistors need to have a datasyeet rating that comfortably exceeds: As a rough approximation, at full load the DC output voltage will normally be between 1 and 1.
The data sheet will present table or graphs showing the minimum limiting resistance needed for a given application. Valve Rectifiers Ordinary valve rectifiers contain two diodes which share the same cathode and heaterin one bottle.
The Valve Wizard
Collection of Giorgio Dataxheet I. This is equal to 2. If the transformer alone doesn’t have enough resistance to meet this requirement then you need to make up the deficit by adding resistors in series with each anode. Telefunken Werkstattbuch Wolfgang Bauer. For the GZ34 this is mA for a capacitor-input rectifier with transformer voltages up to V, but the limit is reduced for higher transformer voltages. As a rough rule of thumb, at full load a valve rectifier will produce a DC voltage that is between 1 and 1.
Collection of Aldo Hz34 CH. Sovtek; Saratov National Electronics, Inc.