Gz37 tube data booklet

I usually tend to use 5u4gbs as the rectifier when needing a high current tube rectifier and account for the larger voltage drop with the correct transformer however the 5ar4gz34 is a good tube as well. Antique radio forums view topic western electric ks15560. My favorite tubes and their substitutes by robert h. Please see the substitutes at the top of the page for more details. The 5ar4 and gz34 is an indirectly heated cathode tube which means it takes longer to warm up. This tube would intermittently flash and short out the power supply. Premium nos and modern production rectifier tubes 5u4, gz32, gz345ar4, 5y3, 6x4 and other rectifier tubes. Purchasing tis tube has been a big waste of time and money. I have only listened to the mullard cv378 big bottle early 1950s tubes for a short while. I then removed the amp and tested it on the bench with a current limiter and variac. Bold designators are close or identical, italic designators are different ratings, different pinouts or different filament voltages.

The gz37 cv378 is a tall version of a 5ar4gz34 valve. The later gz34 has a maximum current rating of 160 ma whereas this can rectify almost twice that. In the case of a switched ht type, a poorly implemented standby can promote current voltage surges when actuated, which can act to shorten operational life. These are regarded as the best valves of their type ever made and original mullard items are high prized by musicians broadcasters and audiophiles the world over due to their sound quality. According to the tube substitution handbook the following tubes can be substituted for each other.

This is a suitable replacement for any cv378gz37 tube type. This is a suitable replacement for any gz33 cv5745 fullwave rectifier tube type. With almost datasheets and the visitor counter indicates over 4000. Always check the bias and idle power of the tube with the new rectifier to be certain that it is running within spec. It depends what exactly is meant by standby, and how its implemented. Mullard nos nib gz37cv378 another very well known rectifier which can often be used in place of a 5ar4 gz34. Gz37cv378 mullard a gz37 is 5 tall and is not an exact dropin replacement for a 5ar4gz34 mullard, but can be substituted for one in many applications. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. You should consult the manufacturer of your equipment too if there are questions.

The tube that launched a 100,000 british quad ii amplifiers. The following guidelines should be taken into account. I quickly turned it off and then swapped it for a jj gz34 i had. Now the amp works fine but i dont think this is the correct replacement tube. The mullard really makes a difference in your hifi or guitar amp sound. Well i smelled something burning and i looked in the back and the rectifier tube was red hot.

Gz33cv5745 mullard the gz33 looks the same as gz37, plate resistance slightly higher, you can use a higher microfarad uf input cap than gz37, when using 10h filter choke max output current is 300ma max vs. Only 4 in stock so grab them if you want a really good rectifier tube for you original quad ii amps. Replacing the rectifier tube is a good way to get a different sound from your amp. Rectifier comparison and interchangeability chart kca. The gz34 is an example of a typical high current rectifier for small equipment use. Substitutes are given as a guide only please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application. Mullard gz3234375u4g rectifier tubes audio asylum trader. These are nos in original military boxes with most being from 1952 get them while they last. The only thing you have to do it make sure that sure you have enough height clearance.

The only additional tube setting information i have is from april 1958, which doesnt include the cv type tubes. Jan 09, 2011 hi, im getting confused, ive got a puresound a30 integrated that uses chinese 5z4p rectifier valves, one of which has just died on me, i need to know where to get one, or is it really a 100% substitute for a gz34. Before buying any 5ar4, 5u4, gz33, or gz37, here is a hot ticket from uncle kevvy. Going from one type to another such as 5u4gb to gz34 will give you different tones and different sag characteristics. Brand new in military or oem boxes, made by mullard in the 1950s. They developed many iconic valve such as the ecc83, ef86, el34,el37, el84, gz34 and gz37. This exhibit has dual labeling as the cossor type 53ku and as the gz37 which is a mullard type. F and the valve needs a minimum effective series resistance of 75 ohms to. Tube gz 34 or rohre gz34 id3410, fullwave vacuum rectifier, octal int. Tubes free delivery possible on eligible purchases. However, some things must be considered when changing rectifier tubes. The free shipping option allows tubedepot to choose the most appropriate carrier and service.

It is indirectly heated but the cathode is tied to one side of the heater. Rectifier tubes tagged gz32 gz33 gz37 upscale audio. Without a doubt the finest gz37 available today only exceeded by the high wycombe cv378 fat glass. The problem is for example, cv378 gz37 53ku u54, i couldnt find anything in the 15560 for any of these tubes. A tube that gives lower voltage may not be able to handle the current of. Rectifier tube question between gz34, 5v4ga, and 5v4g the. There are various sources for rectifier tube data sheets free on the net. I then reinstalled the old tube and the amp has worked with no problems since.

I bought it used and it had a 5v4ga sylvania in it. The gz37 is an indirectly heated full wave rectifier with a considerable rating. From what i have been able to determine the nos mullard i am using first series fat base has different voltage characteristics than other vintage mullard tubes. Capacitor input f 50 hz utreff 2x300 2x400 2x500 2x550 v. Gz37 cv378 53ku u54 mullard fullwave rectifier nos. The bid is for 4 russian tubes in individual boxes. Tube cv 378 or rohre cv378 id281, fullwave vacuum rectifier, octal int. We test our rectifier tubes on a tube tester that tests each half individually to insure that both sides are equally strong. I guess ill try doing a search on foreign tube test data to see if i can come up with anything.